57631561 has 8 divisors (see below), whose sum is σ = 62483400. Its totient is φ = 52839552.

The previous prime is 57631559. The next prime is 57631571. The reversal of 57631561 is 16513675.

It can be written as a sum of positive squares in 4 ways, for example, as 4923961 + 52707600 = 2219^2 + 7260^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57631561 - 2¹ = 57631559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57631571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12940 + ... + 16813.

It is an arithmetic number, because the mean of its divisors is an integer number (7810425).

Almost surely, 2^57631561 is an apocalyptic number.

It is an amenable number.

57631561 is a deficient number, since it is larger than the sum of its proper divisors (4851839).

57631561 is a wasteful number, since it uses less digits than its factorization.

57631561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29915.

The product of its digits is 18900, while the sum is 34.

The square root of 57631561 is about 7591.5453630997. The cubic root of 57631561 is about 386.2662775613.

The spelling of 57631561 in words is "fifty-seven million, six hundred thirty-one thousand, five hundred sixty-one".