52921409 has 2 divisors, whose sum is σ = 52921410. Its totient is φ = 52921408.

The previous prime is 52921399. The next prime is 52921411. The reversal of 52921409 is 90412925.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27196225 + 25725184 = 5215^2 + 5072^2 .

It is a cyclic number.

It is not a de Polignac number, because 52921409 - 2¹² = 52917313 is a prime.

It is a Sophie Germain prime.

Together with 52921411, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (52921439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26460704 + 26460705.

It is an arithmetic number, because the mean of its divisors is an integer number (26460705).

Almost surely, 2^52921409 is an apocalyptic number.

It is an amenable number.

52921409 is a deficient number, since it is larger than the sum of its proper divisors (1).

52921409 is an equidigital number, since it uses as much as digits as its factorization.

52921409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 52921409 is about 7274.7102347791. The cubic root of 52921409 is about 375.4428167482.

The spelling of 52921409 in words is "fifty-two million, nine hundred twenty-one thousand, four hundred nine".