131555437 has 4 divisors (see below), whose sum is σ = 141675100. Its totient is φ = 121435776.

The previous prime is 131555383. The next prime is 131555443. The reversal of 131555437 is 734555131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 734555131 = 5107 ⋅143833.

It can be written as a sum of positive squares in 2 ways, for example, as 54922921 + 76632516 = 7411^2 + 8754^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131555437 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 (131555477) 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, 5059812 + ... + 5059837.

It is an arithmetic number, because the mean of its divisors is an integer number (35418775).

Almost surely, 2^131555437 is an apocalyptic number.

It is an amenable number.

131555437 is a deficient number, since it is larger than the sum of its proper divisors (10119663).

131555437 is a wasteful number, since it uses less digits than its factorization.

131555437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10119662.

The product of its digits is 31500, while the sum is 34.

The square root of 131555437 is about 11469.7618545461. The cubic root of 131555437 is about 508.5920889454.

The spelling of 131555437 in words is "one hundred thirty-one million, five hundred fifty-five thousand, four hundred thirty-seven".