57697421 has 2 divisors, whose sum is σ = 57697422. Its totient is φ = 57697420.

The previous prime is 57697397. The next prime is 57697429. The reversal of 57697421 is 12479675.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56400100 + 1297321 = 7510^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 57697421 - 2¹⁸ = 57435277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57697429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28848710 + 28848711.

It is an arithmetic number, because the mean of its divisors is an integer number (28848711).

Almost surely, 2^57697421 is an apocalyptic number.

It is an amenable number.

57697421 is a deficient number, since it is larger than the sum of its proper divisors (1).

57697421 is an equidigital number, since it uses as much as digits as its factorization.

57697421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 57697421 is about 7595.8818447893. The cubic root of 57697421 is about 386.4133602373.

The spelling of 57697421 in words is "fifty-seven million, six hundred ninety-seven thousand, four hundred twenty-one".