10631981 has 2 divisors, whose sum is σ = 10631982. Its totient is φ = 10631980.

The previous prime is 10631941. The next prime is 10632019. The reversal of 10631981 is 18913601.

It is a happy number.

10631981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8213956 + 2418025 = 2866^2 + 1555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10631981 is a prime.

It is a super-2 number, since 2×10631981² = 226078039968722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10631921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5315990 + 5315991.

It is an arithmetic number, because the mean of its divisors is an integer number (5315991).

Almost surely, 2^10631981 is an apocalyptic number.

It is an amenable number.

10631981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10631981 is an equidigital number, since it uses as much as digits as its factorization.

10631981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 10631981 is about 3260.6718632822. The cubic root of 10631981 is about 219.8896209381.

The spelling of 10631981 in words is "ten million, six hundred thirty-one thousand, nine hundred eighty-one".