55430731 has 2 divisors, whose sum is σ = 55430732. Its totient is φ = 55430730.

The previous prime is 55430717. The next prime is 55430737. The reversal of 55430731 is 13703455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55430731 - 2¹⁹ = 54906443 is a prime.

It is a super-2 number, since 2×55430731² = 6145131878388722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55430731.

It is not a weakly prime, because it can be changed into another prime (55430737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27715365 + 27715366.

It is an arithmetic number, because the mean of its divisors is an integer number (27715366).

Almost surely, 2^55430731 is an apocalyptic number.

55430731 is a deficient number, since it is larger than the sum of its proper divisors (1).

55430731 is an equidigital number, since it uses as much as digits as its factorization.

55430731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 55430731 is about 7445.1817304885. The cubic root of 55430731 is about 381.2854229919.

The spelling of 55430731 in words is "fifty-five million, four hundred thirty thousand, seven hundred thirty-one".