31312421377 has 2 divisors, whose sum is σ = 31312421378. Its totient is φ = 31312421376.

The previous prime is 31312421353. The next prime is 31312421411. The reversal of 31312421377 is 77312421313.

It is an a-pointer prime, because the next prime (31312421411) can be obtained adding 31312421377 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20690233281 + 10622188096 = 143841^2 + 103064^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312421377 - 2¹¹ = 31312419329 is a prime.

It is a super-2 number, since 2×31312421377² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31312481377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656210688 + 15656210689.

It is an arithmetic number, because the mean of its divisors is an integer number (15656210689).

Almost surely, 2^31312421377 is an apocalyptic number.

It is an amenable number.

31312421377 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312421377 is an equidigital number, since it uses as much as digits as its factorization.

31312421377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 34.

The spelling of 31312421377 in words is "thirty-one billion, three hundred twelve million, four hundred twenty-one thousand, three hundred seventy-seven".