131646431 has 4 divisors (see below), whose sum is σ = 150453072. Its totient is φ = 112839792.

The previous prime is 131646401. The next prime is 131646433. The reversal of 131646431 is 134646131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134646131 = 2729 ⋅49339.

It is a cyclic number.

It is not a de Polignac number, because 131646431 - 2¹⁴ = 131630047 is a prime.

It is a super-2 number, since 2×131646431² = 34661565590075522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131646394 and 131646403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131646433) 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, 9403310 + ... + 9403323.

It is an arithmetic number, because the mean of its divisors is an integer number (37613268).

Almost surely, 2^131646431 is an apocalyptic number.

131646431 is a deficient number, since it is larger than the sum of its proper divisors (18806641).

131646431 is an equidigital number, since it uses as much as digits as its factorization.

131646431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18806640.

The product of its digits is 5184, while the sum is 29.

The square root of 131646431 is about 11473.7278597673. The cubic root of 131646431 is about 508.7093225712.

The spelling of 131646431 in words is "one hundred thirty-one million, six hundred forty-six thousand, four hundred thirty-one".