57721337 has 2 divisors, whose sum is σ = 57721338. Its totient is φ = 57721336.

The previous prime is 57721331. The next prime is 57721357. The reversal of 57721337 is 73312775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29800681 + 27920656 = 5459^2 + 5284^2 .

It is a cyclic number.

It is not a de Polignac number, because 57721337 - 2¹² = 57717241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 57721297 and 57721306.

It is not a weakly prime, because it can be changed into another prime (57721331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28860668 + 28860669.

It is an arithmetic number, because the mean of its divisors is an integer number (28860669).

Almost surely, 2^57721337 is an apocalyptic number.

It is an amenable number.

57721337 is a deficient number, since it is larger than the sum of its proper divisors (1).

57721337 is an equidigital number, since it uses as much as digits as its factorization.

57721337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30870, while the sum is 35.

The square root of 57721337 is about 7597.4559557789. The cubic root of 57721337 is about 386.4667432434.

The spelling of 57721337 in words is "fifty-seven million, seven hundred twenty-one thousand, three hundred thirty-seven".