131551421 has 16 divisors (see below), whose sum is σ = 145031040. Its totient is φ = 118768320.

The previous prime is 131551417. The next prime is 131551429. The reversal of 131551421 is 124155131.

It is not a de Polignac number, because 131551421 - 2² = 131551417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131551429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201131 + ... + 201783.

It is an arithmetic number, because the mean of its divisors is an integer number (9064440).

Almost surely, 2^131551421 is an apocalyptic number.

It is an amenable number.

131551421 is a deficient number, since it is larger than the sum of its proper divisors (13479619).

131551421 is a wasteful number, since it uses less digits than its factorization.

131551421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156.

The product of its digits is 600, while the sum is 23.

The square root of 131551421 is about 11469.5867841871. The cubic root of 131551421 is about 508.5869136199.

The spelling of 131551421 in words is "one hundred thirty-one million, five hundred fifty-one thousand, four hundred twenty-one".