57199621 has 4 divisors (see below), whose sum is σ = 57267532. Its totient is φ = 57131712.

The previous prime is 57199591. The next prime is 57199627. The reversal of 57199621 is 12699175.

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 26894596 + 30305025 = 5186^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 57199621 - 2¹³ = 57191429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57199627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32676 + ... + 34381.

It is an arithmetic number, because the mean of its divisors is an integer number (14316883).

Almost surely, 2^57199621 is an apocalyptic number.

It is an amenable number.

57199621 is a deficient number, since it is larger than the sum of its proper divisors (67911).

57199621 is an equidigital number, since it uses as much as digits as its factorization.

57199621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67910.

The product of its digits is 34020, while the sum is 40.

The square root of 57199621 is about 7563.0431044653. The cubic root of 57199621 is about 385.2988538058.

The spelling of 57199621 in words is "fifty-seven million, one hundred ninety-nine thousand, six hundred twenty-one".