57661831 has 4 divisors (see below), whose sum is σ = 59650200. Its totient is φ = 55673464.

The previous prime is 57661823. The next prime is 57661847. The reversal of 57661831 is 13816675.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57661831 - 2³ = 57661823 is a prime.

It is a super-2 number, since 2×57661831² = 6649773508545122, 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 (57661811) 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 3 ways as a sum of consecutive naturals, for example, 994141 + ... + 994198.

It is an arithmetic number, because the mean of its divisors is an integer number (14912550).

Almost surely, 2^57661831 is an apocalyptic number.

57661831 is a deficient number, since it is larger than the sum of its proper divisors (1988369).

57661831 is a wasteful number, since it uses less digits than its factorization.

57661831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988368.

The product of its digits is 30240, while the sum is 37.

The square root of 57661831 is about 7593.5387666094. The cubic root of 57661831 is about 386.3338923287. Note that the first 3 decimals are identical.

The spelling of 57661831 in words is "fifty-seven million, six hundred sixty-one thousand, eight hundred thirty-one".