53621539 has 2 divisors, whose sum is σ = 53621540. Its totient is φ = 53621538.

The previous prime is 53621509. The next prime is 53621549. The reversal of 53621539 is 93512635.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53621539 - 2¹⁷ = 53490467 is a prime.

It is not a weakly prime, because it can be changed into another prime (53621509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26810769 + 26810770.

It is an arithmetic number, because the mean of its divisors is an integer number (26810770).

Almost surely, 2^53621539 is an apocalyptic number.

53621539 is a deficient number, since it is larger than the sum of its proper divisors (1).

53621539 is an equidigital number, since it uses as much as digits as its factorization.

53621539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24300, while the sum is 34.

The square root of 53621539 is about 7322.6729409417. The cubic root of 53621539 is about 377.0912236708.

The spelling of 53621539 in words is "fifty-three million, six hundred twenty-one thousand, five hundred thirty-nine".