531866131 has 4 divisors (see below), whose sum is σ = 563152392. Its totient is φ = 500579872.

The previous prime is 531866129. The next prime is 531866173. The reversal of 531866131 is 131668135.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131668135 = 5 ⋅26333627.

It is a cyclic number.

It is not a de Polignac number, because 531866131 - 2¹ = 531866129 is a prime.

It is a super-2 number, since 2×531866131² = 565763162609818322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531863131) 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, 15643105 + ... + 15643138.

It is an arithmetic number, because the mean of its divisors is an integer number (140788098).

Almost surely, 2^531866131 is an apocalyptic number.

531866131 is a deficient number, since it is larger than the sum of its proper divisors (31286261).

531866131 is a wasteful number, since it uses less digits than its factorization.

531866131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31286260.

The product of its digits is 12960, while the sum is 34.

The square root of 531866131 is about 23062.2230281471. The cubic root of 531866131 is about 810.2159313559.

The spelling of 531866131 in words is "five hundred thirty-one million, eight hundred sixty-six thousand, one hundred thirty-one".