55749991 has 8 divisors (see below), whose sum is σ = 61156368. Its totient is φ = 50400000.

The previous prime is 55749937. The next prime is 55750033. The reversal of 55749991 is 19994755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55749991 - 2⁹ = 55749479 is a prime.

It is a super-2 number, since 2×55749991² = 6216122993000162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55749931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12010 + ... + 15991.

It is an arithmetic number, because the mean of its divisors is an integer number (7644546).

Almost surely, 2^55749991 is an apocalyptic number.

55749991 is a deficient number, since it is larger than the sum of its proper divisors (5406377).

55749991 is a wasteful number, since it uses less digits than its factorization.

55749991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28193.

The product of its digits is 510300, while the sum is 49.

The square root of 55749991 is about 7466.5916588494. The cubic root of 55749991 is about 382.0160419238.

The spelling of 55749991 in words is "fifty-five million, seven hundred forty-nine thousand, nine hundred ninety-one".