13630981 has 8 divisors (see below), whose sum is σ = 16776704. Its totient is φ = 10784880.

The previous prime is 13630937. The next prime is 13630997. The reversal of 13630981 is 18903631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13630981 - 2⁹ = 13630469 is a prime.

It is a super-2 number, since 2×13630981² = 371607286044722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13630181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74805 + ... + 74986.

It is an arithmetic number, because the mean of its divisors is an integer number (2097088).

Almost surely, 2^13630981 is an apocalyptic number.

It is an amenable number.

13630981 is a deficient number, since it is larger than the sum of its proper divisors (3145723).

13630981 is a wasteful number, since it uses less digits than its factorization.

13630981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149811.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 13630981 is about 3692.0158450364. The cubic root of 13630981 is about 238.8777524124.

The spelling of 13630981 in words is "thirteen million, six hundred thirty thousand, nine hundred eighty-one".