57151621 has 2 divisors, whose sum is σ = 57151622. Its totient is φ = 57151620.

The previous prime is 57151607. The next prime is 57151673. The reversal of 57151621 is 12615175.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35164900 + 21986721 = 5930^2 + 4689^2 .

It is a cyclic number.

It is not a de Polignac number, because 57151621 - 2²¹ = 55054469 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57151621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57151121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28575810 + 28575811.

It is an arithmetic number, because the mean of its divisors is an integer number (28575811).

Almost surely, 2^57151621 is an apocalyptic number.

It is an amenable number.

57151621 is a deficient number, since it is larger than the sum of its proper divisors (1).

57151621 is an equidigital number, since it uses as much as digits as its factorization.

57151621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 28.

The square root of 57151621 is about 7559.8691126236. The cubic root of 57151621 is about 385.1910470270.

Adding to 57151621 its reverse (12615175), we get a palindrome (69766796).

The spelling of 57151621 in words is "fifty-seven million, one hundred fifty-one thousand, six hundred twenty-one".