251425442 has 16 divisors (see below), whose sum is σ = 397710240. Its totient is φ = 118879488.

The previous prime is 251425439. The next prime is 251425457. The reversal of 251425442 is 244524152.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16193 + ... + 27659.

It is an arithmetic number, because the mean of its divisors is an integer number (24856890).

Almost surely, 2^251425442 is an apocalyptic number.

251425442 is a deficient number, since it is larger than the sum of its proper divisors (146284798).

251425442 is a wasteful number, since it uses less digits than its factorization.

251425442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12065.

The product of its digits is 12800, while the sum is 29.

The square root of 251425442 is about 15856.4006634545. The cubic root of 251425442 is about 631.1555528140.

Adding to 251425442 its reverse (244524152), we get a palindrome (495949594).

The spelling of 251425442 in words is "two hundred fifty-one million, four hundred twenty-five thousand, four hundred forty-two".