52657421 has 2 divisors, whose sum is σ = 52657422. Its totient is φ = 52657420.

The previous prime is 52657399. The next prime is 52657427. The reversal of 52657421 is 12475625.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34975396 + 17682025 = 5914^2 + 4205^2 .

It is a cyclic number.

It is not a de Polignac number, because 52657421 - 2⁶ = 52657357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52657427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26328710 + 26328711.

It is an arithmetic number, because the mean of its divisors is an integer number (26328711).

Almost surely, 2^52657421 is an apocalyptic number.

It is an amenable number.

52657421 is a deficient number, since it is larger than the sum of its proper divisors (1).

52657421 is an equidigital number, since it uses as much as digits as its factorization.

52657421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 52657421 is about 7256.5433230981. The cubic root of 52657421 is about 374.8175017179.

The spelling of 52657421 in words is "fifty-two million, six hundred fifty-seven thousand, four hundred twenty-one".