13631203961 has 2 divisors, whose sum is σ = 13631203962. Its totient is φ = 13631203960.

The previous prime is 13631203909. The next prime is 13631203969. The reversal of 13631203961 is 16930213631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13466209936 + 164994025 = 116044^2 + 12845^2 .

It is an emirp because it is prime and its reverse (16930213631) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13631203961 is a prime.

It is not a weakly prime, because it can be changed into another prime (13631203969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6815601980 + 6815601981.

It is an arithmetic number, because the mean of its divisors is an integer number (6815601981).

Almost surely, 2^13631203961 is an apocalyptic number.

It is an amenable number.

13631203961 is a deficient number, since it is larger than the sum of its proper divisors (1).

13631203961 is an equidigital number, since it uses as much as digits as its factorization.

13631203961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 13631203961 in words is "thirteen billion, six hundred thirty-one million, two hundred three thousand, nine hundred sixty-one".