57661231 has 16 divisors (see below), whose sum is σ = 60480000. Its totient is φ = 54939456.

The previous prime is 57661217. The next prime is 57661249. The reversal of 57661231 is 13216675.

57661231 is nontrivially palindromic in base 3.

It is a cyclic number.

It is not a de Polignac number, because 57661231 - 2⁷ = 57661103 is a prime.

It is a super-2 number, since 2×57661231² = 6649635120870722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 57661193 and 57661202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57661031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414760 + ... + 414898.

It is an arithmetic number, because the mean of its divisors is an integer number (3780000).

Almost surely, 2^57661231 is an apocalyptic number.

57661231 is a deficient number, since it is larger than the sum of its proper divisors (2818769).

57661231 is a wasteful number, since it uses less digits than its factorization.

57661231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366.

The product of its digits is 7560, while the sum is 31.

The square root of 57661231 is about 7593.4992592348. The cubic root of 57661231 is about 386.3325523253.

The spelling of 57661231 in words is "fifty-seven million, six hundred sixty-one thousand, two hundred thirty-one".