55447491 has 32 divisors (see below), whose sum is σ = 85524480. Its totient is φ = 31600800.

The previous prime is 55447471. The next prime is 55447531. The reversal of 55447491 is 19474455.

It is not a de Polignac number, because 55447491 - 2¹¹ = 55445443 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (55447471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119526 + ... + 119988.

It is an arithmetic number, because the mean of its divisors is an integer number (2672640).

Almost surely, 2^55447491 is an apocalyptic number.

55447491 is a deficient number, since it is larger than the sum of its proper divisors (30076989).

55447491 is a wasteful number, since it uses less digits than its factorization.

55447491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687.

The product of its digits is 100800, while the sum is 39.

The square root of 55447491 is about 7446.3072055886. The cubic root of 55447491 is about 381.3238475242.

The spelling of 55447491 in words is "fifty-five million, four hundred forty-seven thousand, four hundred ninety-one".