131240551 has 4 divisors (see below), whose sum is σ = 141335992. Its totient is φ = 121145112.

The previous prime is 131240537. The next prime is 131240563. The reversal of 131240551 is 155042131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155042131 = 5189 ⋅29879.

It is a cyclic number.

It is not a de Polignac number, because 131240551 - 2²⁵ = 97686119 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 (131240521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5047701 + ... + 5047726.

It is an arithmetic number, because the mean of its divisors is an integer number (35333998).

Almost surely, 2^131240551 is an apocalyptic number.

131240551 is a deficient number, since it is larger than the sum of its proper divisors (10095441).

131240551 is a wasteful number, since it uses less digits than its factorization.

131240551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10095440.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 131240551 is about 11456.0268417982. The cubic root of 131240551 is about 508.1859826491.

Adding to 131240551 its reverse (155042131), we get a palindrome (286282682).

The spelling of 131240551 in words is "one hundred thirty-one million, two hundred forty thousand, five hundred fifty-one".