31154349917 has 2 divisors, whose sum is σ = 31154349918. Its totient is φ = 31154349916.

The previous prime is 31154349907. The next prime is 31154349937. The reversal of 31154349917 is 71994345113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30447109081 + 707240836 = 174491^2 + 26594^2 .

It is a cyclic number.

It is not a de Polignac number, because 31154349917 - 2¹⁴ = 31154333533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31154349907) 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, 15577174958 + 15577174959.

It is an arithmetic number, because the mean of its divisors is an integer number (15577174959).

Almost surely, 2^31154349917 is an apocalyptic number.

It is an amenable number.

31154349917 is a deficient number, since it is larger than the sum of its proper divisors (1).

31154349917 is an equidigital number, since it uses as much as digits as its factorization.

31154349917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 47.

The spelling of 31154349917 in words is "thirty-one billion, one hundred fifty-four million, three hundred forty-nine thousand, nine hundred seventeen".