55787491 has 4 divisors (see below), whose sum is σ = 55967184. Its totient is φ = 55607800.

The previous prime is 55787467. The next prime is 55787531. The reversal of 55787491 is 19478755.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55787491 is a prime.

It is a super-2 number, since 2×55787491² = 6224488304150162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55787411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89380 + ... + 90001.

It is an arithmetic number, because the mean of its divisors is an integer number (13991796).

Almost surely, 2^55787491 is an apocalyptic number.

55787491 is a deficient number, since it is larger than the sum of its proper divisors (179693).

55787491 is a wasteful number, since it uses less digits than its factorization.

55787491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179692.

The product of its digits is 352800, while the sum is 46.

The square root of 55787491 is about 7469.1024226476. The cubic root of 55787491 is about 382.1016765610.

The spelling of 55787491 in words is "fifty-five million, seven hundred eighty-seven thousand, four hundred ninety-one".