31150510381 has 2 divisors, whose sum is σ = 31150510382. Its totient is φ = 31150510380.

The previous prime is 31150510373. The next prime is 31150510403. The reversal of 31150510381 is 18301505113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30604353481 + 546156900 = 174941^2 + 23370^2 .

It is a cyclic number.

It is not a de Polignac number, because 31150510381 - 2³ = 31150510373 is a prime.

It is a super-2 number, since 2×31150510381² (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 (31150510351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15575255190 + 15575255191.

It is an arithmetic number, because the mean of its divisors is an integer number (15575255191).

Almost surely, 2^31150510381 is an apocalyptic number.

It is an amenable number.

31150510381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31150510381 is an equidigital number, since it uses as much as digits as its factorization.

31150510381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 31150510381 in words is "thirty-one billion, one hundred fifty million, five hundred ten thousand, three hundred eighty-one".