131231155551 has 8 divisors (see below), whose sum is σ = 175068601344. Its totient is φ = 87440573400.

The previous prime is 131231155543. The next prime is 131231155603. The reversal of 131231155551 is 155551132131.

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

It is not a de Polignac number, because 131231155551 - 2³ = 131231155543 is a prime.

It is a super-2 number, since 2×131231155551² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231155501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11709375 + ... + 11720576.

It is an arithmetic number, because the mean of its divisors is an integer number (21883575168).

Almost surely, 2^131231155551 is an apocalyptic number.

131231155551 is a deficient number, since it is larger than the sum of its proper divisors (43837445793).

131231155551 is a wasteful number, since it uses less digits than its factorization.

131231155551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23431821.

The product of its digits is 11250, while the sum is 33.

Adding to 131231155551 its reverse (155551132131), we get a palindrome (286782287682).

The spelling of 131231155551 in words is "one hundred thirty-one billion, two hundred thirty-one million, one hundred fifty-five thousand, five hundred fifty-one".