53939621 has 2 divisors, whose sum is σ = 53939622. Its totient is φ = 53939620.

The previous prime is 53939617. The next prime is 53939653. The reversal of 53939621 is 12693935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50608996 + 3330625 = 7114^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 53939621 - 2² = 53939617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53939321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26969810 + 26969811.

It is an arithmetic number, because the mean of its divisors is an integer number (26969811).

Almost surely, 2^53939621 is an apocalyptic number.

It is an amenable number.

53939621 is a deficient number, since it is larger than the sum of its proper divisors (1).

53939621 is an equidigital number, since it uses as much as digits as its factorization.

53939621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 38.

The square root of 53939621 is about 7344.3598087240. The cubic root of 53939621 is about 377.8353869244.

The spelling of 53939621 in words is "fifty-three million, nine hundred thirty-nine thousand, six hundred twenty-one".