251406425 has 6 divisors (see below), whose sum is σ = 311743998. Its totient is φ = 201125120.

The previous prime is 251406403. The next prime is 251406427. The reversal of 251406425 is 524604152.

It can be written as a sum of positive squares in 3 ways, for example, as 31091776 + 220314649 = 5576^2 + 14843^2 .

It is not a de Polignac number, because 251406425 - 2¹² = 251402329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (251406427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5028104 + ... + 5028153.

It is an arithmetic number, because the mean of its divisors is an integer number (51957333).

Almost surely, 2^251406425 is an apocalyptic number.

251406425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251406425 is a deficient number, since it is larger than the sum of its proper divisors (60337573).

251406425 is a wasteful number, since it uses less digits than its factorization.

251406425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10056267 (or 10056262 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 251406425 is about 15855.8009889125. The cubic root of 251406425 is about 631.1396395640.

The spelling of 251406425 in words is "two hundred fifty-one million, four hundred six thousand, four hundred twenty-five".