2131577 has 4 divisors (see below), whose sum is σ = 2436096. Its totient is φ = 1827060.

The previous prime is 2131573. The next prime is 2131601. The reversal of 2131577 is 7751312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2131577 - 2² = 2131573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152249 + ... + 152262.

It is an arithmetic number, because the mean of its divisors is an integer number (609024).

2^2131577 is an apocalyptic number.

It is an amenable number.

2131577 is a deficient number, since it is larger than the sum of its proper divisors (304519).

2131577 is an equidigital number, since it uses as much as digits as its factorization.

2131577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304518.

The product of its digits is 1470, while the sum is 26.

The square root of 2131577 is about 1459.9921232664. The cubic root of 2131577 is about 128.6965807234.

Adding to 2131577 its reverse (7751312), we get a palindrome (9882889).

The spelling of 2131577 in words is "two million, one hundred thirty-one thousand, five hundred seventy-seven".