55403237 has 2 divisors, whose sum is σ = 55403238. Its totient is φ = 55403236.

The previous prime is 55403233. The next prime is 55403239. The reversal of 55403237 is 73230455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55338721 + 64516 = 7439^2 + 254^2 .

It is a cyclic number.

It is not a de Polignac number, because 55403237 - 2² = 55403233 is a prime.

Together with 55403239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55403233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27701618 + 27701619.

It is an arithmetic number, because the mean of its divisors is an integer number (27701619).

Almost surely, 2^55403237 is an apocalyptic number.

It is an amenable number.

55403237 is a deficient number, since it is larger than the sum of its proper divisors (1).

55403237 is an equidigital number, since it uses as much as digits as its factorization.

55403237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 29.

The square root of 55403237 is about 7443.3350723987. The cubic root of 55403237 is about 381.2223725568. Note that the first 3 decimals are identical.

The spelling of 55403237 in words is "fifty-five million, four hundred three thousand, two hundred thirty-seven".