13961357531 has 4 divisors (see below), whose sum is σ = 15230571864. Its totient is φ = 12692143200.

The previous prime is 13961357521. The next prime is 13961357609. The reversal of 13961357531 is 13575316931.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-13961357531 is a prime.

It is a super-2 number, since 2×13961357531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13961357521) 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, 634607150 + ... + 634607171.

It is an arithmetic number, because the mean of its divisors is an integer number (3807642966).

Almost surely, 2^13961357531 is an apocalyptic number.

13961357531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13961357531 is a deficient number, since it is larger than the sum of its proper divisors (1269214333).

13961357531 is a wasteful number, since it uses less digits than its factorization.

13961357531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269214332.

The product of its digits is 255150, while the sum is 44.

The spelling of 13961357531 in words is "thirteen billion, nine hundred sixty-one million, three hundred fifty-seven thousand, five hundred thirty-one".