31641312251 has 2 divisors, whose sum is σ = 31641312252. Its totient is φ = 31641312250.

The previous prime is 31641312217. The next prime is 31641312281. The reversal of 31641312251 is 15221314613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31641312251 - 2³⁰ = 30567570427 is a prime.

It is not a weakly prime, because it can be changed into another prime (31641312281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15820656125 + 15820656126.

It is an arithmetic number, because the mean of its divisors is an integer number (15820656126).

Almost surely, 2^31641312251 is an apocalyptic number.

31641312251 is a deficient number, since it is larger than the sum of its proper divisors (1).

31641312251 is an equidigital number, since it uses as much as digits as its factorization.

31641312251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

Adding to 31641312251 its reverse (15221314613), we get a palindrome (46862626864).

The spelling of 31641312251 in words is "thirty-one billion, six hundred forty-one million, three hundred twelve thousand, two hundred fifty-one".