13131511550 has 24 divisors (see below), whose sum is σ = 24588549000. Its totient is φ = 5217349280.

The previous prime is 13131511517. The next prime is 13131511559. The reversal of 13131511550 is 5511513131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131511559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 873860 + ... + 888759.

It is an arithmetic number, because the mean of its divisors is an integer number (1024522875).

Almost surely, 2^13131511550 is an apocalyptic number.

13131511550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13131511550 is a deficient number, since it is larger than the sum of its proper divisors (11457037450).

13131511550 is a wasteful number, since it uses less digits than its factorization.

13131511550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762780 (or 1762775 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 26.

The spelling of 13131511550 in words is "thirteen billion, one hundred thirty-one million, five hundred eleven thousand, five hundred fifty".