31380704987 has 2 divisors, whose sum is σ = 31380704988. Its totient is φ = 31380704986.

The previous prime is 31380704963. The next prime is 31380705023. The reversal of 31380704987 is 78940708313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31380704987 - 2⁸ = 31380704731 is a prime.

It is a super-2 number, since 2×31380704987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31380704947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15690352493 + 15690352494.

It is an arithmetic number, because the mean of its divisors is an integer number (15690352494).

Almost surely, 2^31380704987 is an apocalyptic number.

31380704987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31380704987 is an equidigital number, since it uses as much as digits as its factorization.

31380704987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 31380704987 in words is "thirty-one billion, three hundred eighty million, seven hundred four thousand, nine hundred eighty-seven".