251425993 has 16 divisors (see below), whose sum is σ = 325736320. Its totient is φ = 188459136.

The previous prime is 251425991. The next prime is 251425997. The reversal of 251425993 is 399524152.

It is a cyclic number.

It is not a de Polignac number, because 251425993 - 2¹ = 251425991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (251425991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70980 + ... + 74437.

It is an arithmetic number, because the mean of its divisors is an integer number (20358520).

Almost surely, 2^251425993 is an apocalyptic number.

It is an amenable number.

251425993 is a deficient number, since it is larger than the sum of its proper divisors (74310327).

251425993 is a wasteful number, since it uses less digits than its factorization.

251425993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145456.

The product of its digits is 97200, while the sum is 40.

The square root of 251425993 is about 15856.4180381321. The cubic root of 251425993 is about 631.1560138738.

The spelling of 251425993 in words is "two hundred fifty-one million, four hundred twenty-five thousand, nine hundred ninety-three".