131866551 has 6 divisors (see below), whose sum is σ = 190473920. Its totient is φ = 87911028.

The previous prime is 131866547. The next prime is 131866571. The reversal of 131866551 is 155668131.

It is not a de Polignac number, because 131866551 - 2² = 131866547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131866541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7325911 + ... + 7325928.

Almost surely, 2^131866551 is an apocalyptic number.

131866551 is a deficient number, since it is larger than the sum of its proper divisors (58607369).

131866551 is a wasteful number, since it uses less digits than its factorization.

131866551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14651845 (or 14651842 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 131866551 is about 11483.3162022127. The cubic root of 131866551 is about 508.9926945865.

The spelling of 131866551 in words is "one hundred thirty-one million, eight hundred sixty-six thousand, five hundred fifty-one".