57197561 has 4 divisors (see below), whose sum is σ = 57218724. Its totient is φ = 57176400.

The previous prime is 57197557. The next prime is 57197563. The reversal of 57197561 is 16579175.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34339600 + 22857961 = 5860^2 + 4781^2 .

It is a cyclic number.

It is not a de Polignac number, because 57197561 - 2² = 57197557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57197563) 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, 5810 + ... + 12171.

It is an arithmetic number, because the mean of its divisors is an integer number (14304681).

Almost surely, 2^57197561 is an apocalyptic number.

It is an amenable number.

57197561 is a deficient number, since it is larger than the sum of its proper divisors (21163).

57197561 is a wasteful number, since it uses less digits than its factorization.

57197561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21162.

The product of its digits is 66150, while the sum is 41.

The square root of 57197561 is about 7562.9069146724. The cubic root of 57197561 is about 385.2942283371.

The spelling of 57197561 in words is "fifty-seven million, one hundred ninety-seven thousand, five hundred sixty-one".