55000031 has 2 divisors, whose sum is σ = 55000032. Its totient is φ = 55000030.

The previous prime is 55000027. The next prime is 55000069. The reversal of 55000031 is 13000055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55000031 - 2² = 55000027 is a prime.

It is a super-2 number, since 2×55000031² = 6050006820001922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55000091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27500015 + 27500016.

It is an arithmetic number, because the mean of its divisors is an integer number (27500016).

Almost surely, 2^55000031 is an apocalyptic number.

55000031 is a deficient number, since it is larger than the sum of its proper divisors (1).

55000031 is an equidigital number, since it uses as much as digits as its factorization.

55000031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75, while the sum is 14.

The square root of 55000031 is about 7416.2005771149. The cubic root of 55000031 is about 380.2953175255.

Adding to 55000031 its reverse (13000055), we get a palindrome (68000086).

The spelling of 55000031 in words is "fifty-five million, thirty-one", and thus it is an aban number and an uban number.