31263006521 has 2 divisors, whose sum is σ = 31263006522. Its totient is φ = 31263006520.

The previous prime is 31263006493. The next prime is 31263006557. The reversal of 31263006521 is 12560036213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22476006400 + 8787000121 = 149920^2 + 93739^2 .

It is a cyclic number.

It is not a de Polignac number, because 31263006521 - 2¹⁰ = 31263005497 is a prime.

It is not a weakly prime, because it can be changed into another prime (31263006421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15631503260 + 15631503261.

It is an arithmetic number, because the mean of its divisors is an integer number (15631503261).

Almost surely, 2^31263006521 is an apocalyptic number.

It is an amenable number.

31263006521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31263006521 is an equidigital number, since it uses as much as digits as its factorization.

31263006521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 31263006521 in words is "thirty-one billion, two hundred sixty-three million, six thousand, five hundred twenty-one".