13641521531 has 8 divisors (see below), whose sum is σ = 15757051824. Its totient is φ = 11671889920.

The previous prime is 13641521521. The next prime is 13641521539. The reversal of 13641521531 is 13512514631.

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

It is not a de Polignac number, because 13641521531 - 2¹⁰ = 13641520507 is a prime.

It is a super-2 number, since 2×13641521531² (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 (13641521539) 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, 36474470 + ... + 36474843.

It is an arithmetic number, because the mean of its divisors is an integer number (1969631478).

Almost surely, 2^13641521531 is an apocalyptic number.

13641521531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13641521531 is a deficient number, since it is larger than the sum of its proper divisors (2115530293).

13641521531 is a wasteful number, since it uses less digits than its factorization.

13641521531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72949341.

The product of its digits is 10800, while the sum is 32.

The spelling of 13641521531 in words is "thirteen billion, six hundred forty-one million, five hundred twenty-one thousand, five hundred thirty-one".