2161377 has 8 divisors (see below), whose sum is σ = 3202080. Its totient is φ = 1440900.

The previous prime is 2161373. The next prime is 2161409. The reversal of 2161377 is 7731612.

2161377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2161377 - 2² = 2161373 is a prime.

It is a super-2 number, since 2×2161377² = 9343101072258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 80051 = 2161377 / (2 + 1 + 6 + 1 + 3 + 7 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 2161377.

It is not an unprimeable number, because it can be changed into a prime (2161373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39999 + ... + 40052.

It is an arithmetic number, because the mean of its divisors is an integer number (400260).

2^2161377 is an apocalyptic number.

2161377 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2161377 is a deficient number, since it is larger than the sum of its proper divisors (1040703).

2161377 is an equidigital number, since it uses as much as digits as its factorization.

2161377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80060 (or 80054 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 2161377 is about 1470.1622359454. The cubic root of 2161377 is about 129.2935446091.

Adding to 2161377 its reverse (7731612), we get a palindrome (9892989).

The spelling of 2161377 in words is "two million, one hundred sixty-one thousand, three hundred seventy-seven".