125217999 has 24 divisors (see below), whose sum is σ = 190944000. Its totient is φ = 78855120.

The previous prime is 125217997. The next prime is 125218013. The reversal of 125217999 is 999712521.

It is not a de Polignac number, because 125217999 - 2¹ = 125217997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125217997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72852 + ... + 74550.

It is an arithmetic number, because the mean of its divisors is an integer number (7956000).

Almost surely, 2^125217999 is an apocalyptic number.

125217999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

125217999 is a deficient number, since it is larger than the sum of its proper divisors (65726001).

125217999 is a wasteful number, since it uses less digits than its factorization.

125217999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155 (or 2152 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 125217999 is about 11190.0848522252. The cubic root of 125217999 is about 500.2904965242.

The spelling of 125217999 in words is "one hundred twenty-five million, two hundred seventeen thousand, nine hundred ninety-nine".