55981299 has 16 divisors (see below), whose sum is σ = 82577664. Its totient is φ = 33448800.

The previous prime is 55981273. The next prime is 55981307. The reversal of 55981299 is 99218955.

It is a happy number.

It is not a de Polignac number, because 55981299 - 2⁹ = 55980787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55981229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9604 + ... + 14289.

It is an arithmetic number, because the mean of its divisors is an integer number (5161104).

Almost surely, 2^55981299 is an apocalyptic number.

55981299 is a deficient number, since it is larger than the sum of its proper divisors (26596365).

55981299 is a wasteful number, since it uses less digits than its factorization.

55981299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23978.

The product of its digits is 291600, while the sum is 48.

The square root of 55981299 is about 7482.0651560916. The cubic root of 55981299 is about 382.5436440438.

It can be divided in two parts, 55981 and 299, that added together give a triangular number (56280 = T₃₃₅).

The spelling of 55981299 in words is "fifty-five million, nine hundred eighty-one thousand, two hundred ninety-nine".