54431991 has 6 divisors (see below), whose sum is σ = 78624000. Its totient is φ = 36287988.

The previous prime is 54431963. The next prime is 54432013. The reversal of 54431991 is 19913445.

It is a happy number.

It is not a de Polignac number, because 54431991 - 2⁵ = 54431959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54431911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3023991 + ... + 3024008.

It is an arithmetic number, because the mean of its divisors is an integer number (13104000).

Almost surely, 2^54431991 is an apocalyptic number.

54431991 is a deficient number, since it is larger than the sum of its proper divisors (24192009).

54431991 is a wasteful number, since it uses less digits than its factorization.

54431991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048005 (or 6048002 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 54431991 is about 7377.8039415533. The cubic root of 54431991 is about 378.9815549719.

The spelling of 54431991 in words is "fifty-four million, four hundred thirty-one thousand, nine hundred ninety-one".