31143615551 has 2 divisors, whose sum is σ = 31143615552. Its totient is φ = 31143615550.

The previous prime is 31143615493. The next prime is 31143615553. The reversal of 31143615551 is 15551634113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31143615551 - 2²⁶ = 31076506687 is a prime.

It is a Sophie Germain prime.

Together with 31143615553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31143615553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571807775 + 15571807776.

It is an arithmetic number, because the mean of its divisors is an integer number (15571807776).

Almost surely, 2^31143615551 is an apocalyptic number.

31143615551 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143615551 is an equidigital number, since it uses as much as digits as its factorization.

31143615551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 35.

The spelling of 31143615551 in words is "thirty-one billion, one hundred forty-three million, six hundred fifteen thousand, five hundred fifty-one".