13721489631 has 6 divisors (see below), whose sum is σ = 19819929480. Its totient is φ = 9147659748.

The previous prime is 13721489623. The next prime is 13721489641. The reversal of 13721489631 is 13698412731.

13721489631 is a `hidden beast` number, since 1 + 3 + 7 + 2 + 1 + 4 + 8 + 9 + 631 = 666.

It is not a de Polignac number, because 13721489631 - 2³ = 13721489623 is a prime.

It is a super-2 number, since 2×13721489631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13721489641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 762304971 + ... + 762304988.

It is an arithmetic number, because the mean of its divisors is an integer number (3303321580).

Almost surely, 2^13721489631 is an apocalyptic number.

13721489631 is a deficient number, since it is larger than the sum of its proper divisors (6098439849).

13721489631 is a wasteful number, since it uses less digits than its factorization.

13721489631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524609965 (or 1524609962 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 13721489631 in words is "thirteen billion, seven hundred twenty-one million, four hundred eighty-nine thousand, six hundred thirty-one".