57236621 has 4 divisors (see below), whose sum is σ = 61639452. Its totient is φ = 52833792.

The previous prime is 57236617. The next prime is 57236629. The reversal of 57236621 is 12663275.

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 8934121 + 48302500 = 2989^2 + 6950^2 .

It is a cyclic number.

It is not a de Polignac number, because 57236621 - 2² = 57236617 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 (57236629) 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, 2201396 + ... + 2201421.

It is an arithmetic number, because the mean of its divisors is an integer number (15409863).

Almost surely, 2^57236621 is an apocalyptic number.

It is an amenable number.

57236621 is a deficient number, since it is larger than the sum of its proper divisors (4402831).

57236621 is a wasteful number, since it uses less digits than its factorization.

57236621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4402830.

The product of its digits is 15120, while the sum is 32.

The square root of 57236621 is about 7565.4888143464. The cubic root of 57236621 is about 385.3819137082.

Adding to 57236621 its reverse (12663275), we get a palindrome (69899896).

The spelling of 57236621 in words is "fifty-seven million, two hundred thirty-six thousand, six hundred twenty-one".