161211377 has 16 divisors (see below), whose sum is σ = 173921280. Its totient is φ = 149083200.

The previous prime is 161211361. The next prime is 161211397. The reversal of 161211377 is 773112161.

It is not a de Polignac number, because 161211377 - 2⁴ = 161211361 is a prime.

It is a super-2 number, since 2×161211377² = 51978216148472258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161211317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91727 + ... + 93467.

It is an arithmetic number, because the mean of its divisors is an integer number (10870080).

Almost surely, 2^161211377 is an apocalyptic number.

It is an amenable number.

161211377 is a deficient number, since it is larger than the sum of its proper divisors (12709903).

161211377 is a wasteful number, since it uses less digits than its factorization.

161211377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904.

The product of its digits is 1764, while the sum is 29.

The square root of 161211377 is about 12696.9042289843. The cubic root of 161211377 is about 544.2501564040.

The spelling of 161211377 in words is "one hundred sixty-one million, two hundred eleven thousand, three hundred seventy-seven".