125138899 has 4 divisors (see below), whose sum is σ = 126378000. Its totient is φ = 123899800.

The previous prime is 125138879. The next prime is 125138917. The reversal of 125138899 is 998831521.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125138899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125138809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619399 + ... + 619600.

It is an arithmetic number, because the mean of its divisors is an integer number (31594500).

Almost surely, 2^125138899 is an apocalyptic number.

125138899 is a deficient number, since it is larger than the sum of its proper divisors (1239101).

125138899 is a wasteful number, since it uses less digits than its factorization.

125138899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239100.

The product of its digits is 155520, while the sum is 46.

The square root of 125138899 is about 11186.5499149648. The cubic root of 125138899 is about 500.1851301119.

It can be divided in two parts, 12513 and 8899, that added together give a palindrome (21412).

The spelling of 125138899 in words is "one hundred twenty-five million, one hundred thirty-eight thousand, eight hundred ninety-nine".