131006399 has 4 divisors (see below), whose sum is σ = 131115264. Its totient is φ = 130897536.

The previous prime is 131006363. The next prime is 131006401. The reversal of 131006399 is 993600131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993600131 = 12347 ⋅80473.

It is a cyclic number.

It is not a de Polignac number, because 131006399 - 2⁸ = 131006143 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 (131006339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52607 + ... + 55040.

It is an arithmetic number, because the mean of its divisors is an integer number (32778816).

Almost surely, 2^131006399 is an apocalyptic number.

131006399 is a deficient number, since it is larger than the sum of its proper divisors (108865).

131006399 is a wasteful number, since it uses less digits than its factorization.

131006399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108864.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 131006399 is about 11445.8026804589. The cubic root of 131006399 is about 507.8835771292.

The spelling of 131006399 in words is "one hundred thirty-one million, six thousand, three hundred ninety-nine".