27731670431 has 2 divisors, whose sum is σ = 27731670432. Its totient is φ = 27731670430.

The previous prime is 27731670409. The next prime is 27731670451. The reversal of 27731670431 is 13407613772.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27731670431 is a prime.

It is a super-2 number, since 2×27731670431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27731670451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13865835215 + 13865835216.

It is an arithmetic number, because the mean of its divisors is an integer number (13865835216).

Almost surely, 2^27731670431 is an apocalyptic number.

27731670431 is a deficient number, since it is larger than the sum of its proper divisors (1).

27731670431 is an equidigital number, since it uses as much as digits as its factorization.

27731670431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 41.

The spelling of 27731670431 in words is "twenty-seven billion, seven hundred thirty-one million, six hundred seventy thousand, four hundred thirty-one".