55972237 has 2 divisors, whose sum is σ = 55972238. Its totient is φ = 55972236.

The previous prime is 55972229. The next prime is 55972243. The reversal of 55972237 is 73227955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46936201 + 9036036 = 6851^2 + 3006^2 .

It is a cyclic number.

It is not a de Polignac number, because 55972237 - 2³ = 55972229 is a prime.

It is a super-3 number, since 3×55972237³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55972237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55972277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27986118 + 27986119.

It is an arithmetic number, because the mean of its divisors is an integer number (27986119).

Almost surely, 2^55972237 is an apocalyptic number.

It is an amenable number.

55972237 is a deficient number, since it is larger than the sum of its proper divisors (1).

55972237 is an equidigital number, since it uses as much as digits as its factorization.

55972237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 40.

The square root of 55972237 is about 7481.4595501145. The cubic root of 55972237 is about 382.5230014505.

The spelling of 55972237 in words is "fifty-five million, nine hundred seventy-two thousand, two hundred thirty-seven".