125279999 has 8 divisors (see below), whose sum is σ = 135144240. Its totient is φ = 115448256.

The previous prime is 125279989. The next prime is 125280013. The reversal of 125279999 is 999972521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125279999 - 2¹² = 125275903 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 125279999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125279989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212 + ... + 15830.

It is an arithmetic number, because the mean of its divisors is an integer number (16893030).

Almost surely, 2^125279999 is an apocalyptic number.

125279999 is a deficient number, since it is larger than the sum of its proper divisors (9864241).

125279999 is a wasteful number, since it uses less digits than its factorization.

125279999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16249.

The product of its digits is 918540, while the sum is 53.

The square root of 125279999 is about 11192.8548190352. The cubic root of 125279999 is about 500.3730535928.

The spelling of 125279999 in words is "one hundred twenty-five million, two hundred seventy-nine thousand, nine hundred ninety-nine".