54431591 has 2 divisors, whose sum is σ = 54431592. Its totient is φ = 54431590.

The previous prime is 54431543. The next prime is 54431617. The reversal of 54431591 is 19513445.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54431591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54431191) 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 as a sum of consecutive naturals, namely, 27215795 + 27215796.

It is an arithmetic number, because the mean of its divisors is an integer number (27215796).

Almost surely, 2^54431591 is an apocalyptic number.

54431591 is a deficient number, since it is larger than the sum of its proper divisors (1).

54431591 is an equidigital number, since it uses as much as digits as its factorization.

54431591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 32.

The square root of 54431591 is about 7377.7768331659. The cubic root of 54431591 is about 378.9806266392.

The spelling of 54431591 in words is "fifty-four million, four hundred thirty-one thousand, five hundred ninety-one".