55315031 has 2 divisors, whose sum is σ = 55315032. Its totient is φ = 55315030.

The previous prime is 55315019. The next prime is 55315033. The reversal of 55315031 is 13051355.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55315031 - 2⁶ = 55314967 is a prime.

It is a super-2 number, since 2×55315031² = 6119505309061922, which contains 22 as substring.

Together with 55315033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55314988 and 55315006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55315033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27657515 + 27657516.

It is an arithmetic number, because the mean of its divisors is an integer number (27657516).

Almost surely, 2^55315031 is an apocalyptic number.

55315031 is a deficient number, since it is larger than the sum of its proper divisors (1).

55315031 is an equidigital number, since it uses as much as digits as its factorization.

55315031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1125, while the sum is 23.

The square root of 55315031 is about 7437.4075456438. The cubic root of 55315031 is about 381.0199538097.

Adding to 55315031 its reverse (13051355), we get a palindrome (68366386).

The spelling of 55315031 in words is "fifty-five million, three hundred fifteen thousand, thirty-one".