55920031 has 2 divisors, whose sum is σ = 55920032. Its totient is φ = 55920030.

The previous prime is 55919999. The next prime is 55920049. The reversal of 55920031 is 13002955.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55920031 - 2⁵ = 55919999 is a prime.

It is a super-2 number, since 2×55920031² = 6254099734081922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55919978 and 55920005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55920331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27960015 + 27960016.

It is an arithmetic number, because the mean of its divisors is an integer number (27960016).

Almost surely, 2^55920031 is an apocalyptic number.

55920031 is a deficient number, since it is larger than the sum of its proper divisors (1).

55920031 is an equidigital number, since it uses as much as digits as its factorization.

55920031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 55920031 is about 7477.9697110914. The cubic root of 55920031 is about 382.4040364727.

Adding to 55920031 its reverse (13002955), we get a palindrome (68922986).

The spelling of 55920031 in words is "fifty-five million, nine hundred twenty thousand, thirty-one".