55431539 has 2 divisors, whose sum is σ = 55431540. Its totient is φ = 55431538.

The previous prime is 55431479. The next prime is 55431547. The reversal of 55431539 is 93513455.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55431539 - 2²⁴ = 38654323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55431499 and 55431508.

It is not a weakly prime, because it can be changed into another prime (55431589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27715769 + 27715770.

It is an arithmetic number, because the mean of its divisors is an integer number (27715770).

Almost surely, 2^55431539 is an apocalyptic number.

55431539 is a deficient number, since it is larger than the sum of its proper divisors (1).

55431539 is an equidigital number, since it uses as much as digits as its factorization.

55431539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 35.

The square root of 55431539 is about 7445.2359935733. The cubic root of 55431539 is about 381.2872756172.

The spelling of 55431539 in words is "fifty-five million, four hundred thirty-one thousand, five hundred thirty-nine".