131643451 has 4 divisors (see below), whose sum is σ = 131670000. Its totient is φ = 131616904.

The previous prime is 131643439. The next prime is 131643487. The reversal of 131643451 is 154346131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154346131 = 5113 ⋅30187.

It is a cyclic number.

It is not a de Polignac number, because 131643451 - 2⁹ = 131642939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131643751) 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, 3376 + ... + 16573.

It is an arithmetic number, because the mean of its divisors is an integer number (32917500).

Almost surely, 2^131643451 is an apocalyptic number.

131643451 is a deficient number, since it is larger than the sum of its proper divisors (26549).

131643451 is an equidigital number, since it uses as much as digits as its factorization.

131643451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26548.

The product of its digits is 4320, while the sum is 28.

The square root of 131643451 is about 11473.5979971411. The cubic root of 131643451 is about 508.7054840946.

Adding to 131643451 its reverse (154346131), we get a palindrome (285989582).

The spelling of 131643451 in words is "one hundred thirty-one million, six hundred forty-three thousand, four hundred fifty-one".