125813999 has 4 divisors (see below), whose sum is σ = 125877336. Its totient is φ = 125750664.

The previous prime is 125813993. The next prime is 125814037. The reversal of 125813999 is 999318521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125813999 - 2¹² = 125809903 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 (125813993) 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, 28589 + ... + 32694.

It is an arithmetic number, because the mean of its divisors is an integer number (31469334).

Almost surely, 2^125813999 is an apocalyptic number.

125813999 is a deficient number, since it is larger than the sum of its proper divisors (63337).

125813999 is an equidigital number, since it uses as much as digits as its factorization.

125813999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63336.

The product of its digits is 174960, while the sum is 47.

The square root of 125813999 is about 11216.6839573913. The cubic root of 125813999 is about 501.0829845952.

The spelling of 125813999 in words is "one hundred twenty-five million, eight hundred thirteen thousand, nine hundred ninety-nine".