31140779 has 2 divisors, whose sum is σ = 31140780. Its totient is φ = 31140778.

The previous prime is 31140763. The next prime is 31140797. The reversal of 31140779 is 97704113.

Together with next prime (31140797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31140779 - 2⁴ = 31140763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31140749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570389 + 15570390.

It is an arithmetic number, because the mean of its divisors is an integer number (15570390).

Almost surely, 2^31140779 is an apocalyptic number.

31140779 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140779 is an equidigital number, since it uses as much as digits as its factorization.

31140779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 31140779 is about 5580.3923697174. The cubic root of 31140779 is about 314.6128745597.

The spelling of 31140779 in words is "thirty-one million, one hundred forty thousand, seven hundred seventy-nine".