12531955 has 4 divisors (see below), whose sum is σ = 15038352. Its totient is φ = 10025560.

The previous prime is 12531919. The next prime is 12531977. The reversal of 12531955 is 55913521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55913521 = 449 ⋅124529.

It is not a de Polignac number, because 12531955 - 2⁹ = 12531443 is a prime.

It is a super-2 number, since 2×12531955² = 314099792244050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253191 + ... + 1253200.

It is an arithmetic number, because the mean of its divisors is an integer number (3759588).

Almost surely, 2^12531955 is an apocalyptic number.

12531955 is a deficient number, since it is larger than the sum of its proper divisors (2506397).

12531955 is an equidigital number, since it uses as much as digits as its factorization.

12531955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506396.

The product of its digits is 6750, while the sum is 31.

The square root of 12531955 is about 3540.0501408878. The cubic root of 12531955 is about 232.2770360277.

The spelling of 12531955 in words is "twelve million, five hundred thirty-one thousand, nine hundred fifty-five".