55531579 has 2 divisors, whose sum is σ = 55531580. Its totient is φ = 55531578.

The previous prime is 55531577. The next prime is 55531583. The reversal of 55531579 is 97513555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55531579 - 2¹ = 55531577 is a prime.

Together with 55531577, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55531577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27765789 + 27765790.

It is an arithmetic number, because the mean of its divisors is an integer number (27765790).

Almost surely, 2^55531579 is an apocalyptic number.

55531579 is a deficient number, since it is larger than the sum of its proper divisors (1).

55531579 is an equidigital number, since it uses as much as digits as its factorization.

55531579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 118125, while the sum is 40.

The square root of 55531579 is about 7451.9513551821. The cubic root of 55531579 is about 381.5165136765.

The spelling of 55531579 in words is "fifty-five million, five hundred thirty-one thousand, five hundred seventy-nine".