13649605631 has 4 divisors (see below), whose sum is σ = 13685244672. Its totient is φ = 13613966592.

The previous prime is 13649605621. The next prime is 13649605633. The reversal of 13649605631 is 13650694631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13650694631 = 7 ⋅1950099233.

It is a cyclic number.

It is not a de Polignac number, because 13649605631 - 2¹⁰ = 13649604607 is a prime.

It is a super-2 number, since 2×13649605631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13649605633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17818946 + ... + 17819711.

It is an arithmetic number, because the mean of its divisors is an integer number (3421311168).

Almost surely, 2^13649605631 is an apocalyptic number.

13649605631 is a deficient number, since it is larger than the sum of its proper divisors (35639041).

13649605631 is an equidigital number, since it uses as much as digits as its factorization.

13649605631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35639040.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 13649605631 in words is "thirteen billion, six hundred forty-nine million, six hundred five thousand, six hundred thirty-one".