30131999 has 2 divisors, whose sum is σ = 30132000. Its totient is φ = 30131998.

The previous prime is 30131993. The next prime is 30132013. The reversal of 30131999 is 99913103.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30131999 - 2²⁰ = 29083423 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30131993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15065999 + 15066000.

It is an arithmetic number, because the mean of its divisors is an integer number (15066000).

Almost surely, 2^30131999 is an apocalyptic number.

30131999 is a deficient number, since it is larger than the sum of its proper divisors (1).

30131999 is an equidigital number, since it uses as much as digits as its factorization.

30131999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 30131999 is about 5489.2621544248. The cubic root of 30131999 is about 311.1783078161.

The spelling of 30131999 in words is "thirty million, one hundred thirty-one thousand, nine hundred ninety-nine".