251925497 has 4 divisors (see below), whose sum is σ = 253530276. Its totient is φ = 250320720.

The previous prime is 251925493. The next prime is 251925511. The reversal of 251925497 is 794529152.

251925497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 107661376 + 144264121 = 10376^2 + 12011^2 .

It is a cyclic number.

It is not a de Polignac number, because 251925497 - 2² = 251925493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (251925491) 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, 802154 + ... + 802467.

It is an arithmetic number, because the mean of its divisors is an integer number (63382569).

Almost surely, 2^251925497 is an apocalyptic number.

It is an amenable number.

251925497 is a deficient number, since it is larger than the sum of its proper divisors (1604779).

251925497 is a wasteful number, since it uses less digits than its factorization.

251925497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604778.

The product of its digits is 226800, while the sum is 44.

The square root of 251925497 is about 15872.1610689912. The cubic root of 251925497 is about 631.5737065748.

The spelling of 251925497 in words is "two hundred fifty-one million, nine hundred twenty-five thousand, four hundred ninety-seven".