55902521 has 2 divisors, whose sum is σ = 55902522. Its totient is φ = 55902520.

The previous prime is 55902481. The next prime is 55902527. The reversal of 55902521 is 12520955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55875625 + 26896 = 7475^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 55902521 - 2¹⁴ = 55886137 is a prime.

It is a super-3 number, since 3×55902521³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (55902527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27951260 + 27951261.

It is an arithmetic number, because the mean of its divisors is an integer number (27951261).

Almost surely, 2^55902521 is an apocalyptic number.

It is an amenable number.

55902521 is a deficient number, since it is larger than the sum of its proper divisors (1).

55902521 is an equidigital number, since it uses as much as digits as its factorization.

55902521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 55902521 is about 7476.7988471003. The cubic root of 55902521 is about 382.3641187929.

The spelling of 55902521 in words is "fifty-five million, nine hundred two thousand, five hundred twenty-one".