131122531 has 4 divisors (see below), whose sum is σ = 132325600. Its totient is φ = 129919464.

The previous prime is 131122507. The next prime is 131122559. The reversal of 131122531 is 135221131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135221131 = 1567 ⋅86293.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131122531 is a prime.

It is a super-2 number, since 2×131122531² = 34386236271691922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131122499 and 131122508.

It is not an unprimeable number, because it can be changed into a prime (131122501) 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, 601371 + ... + 601588.

It is an arithmetic number, because the mean of its divisors is an integer number (33081400).

Almost surely, 2^131122531 is an apocalyptic number.

131122531 is a deficient number, since it is larger than the sum of its proper divisors (1203069).

131122531 is a wasteful number, since it uses less digits than its factorization.

131122531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203068.

The product of its digits is 180, while the sum is 19.

The square root of 131122531 is about 11450.8746827480. The cubic root of 131122531 is about 508.0336057190.

Adding to 131122531 its reverse (135221131), we get a palindrome (266343662).

The spelling of 131122531 in words is "one hundred thirty-one million, one hundred twenty-two thousand, five hundred thirty-one".