57161261 has 4 divisors (see below), whose sum is σ = 57503712. Its totient is φ = 56818812.

The previous prime is 57161249. The next prime is 57161281. The reversal of 57161261 is 16216175.

57161261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 57161261 - 2¹⁰ = 57160237 is a prime.

It is a super-2 number, since 2×57161261² = 6534819518220242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57161231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170975 + ... + 171308.

It is an arithmetic number, because the mean of its divisors is an integer number (14375928).

Almost surely, 2^57161261 is an apocalyptic number.

It is an amenable number.

57161261 is a deficient number, since it is larger than the sum of its proper divisors (342451).

57161261 is a wasteful number, since it uses less digits than its factorization.

57161261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342450.

The product of its digits is 2520, while the sum is 29.

The square root of 57161261 is about 7560.5066629162. The cubic root of 57161261 is about 385.2127030644.

The spelling of 57161261 in words is "fifty-seven million, one hundred sixty-one thousand, two hundred sixty-one".