251424661 has 8 divisors (see below), whose sum is σ = 264680640. Its totient is φ = 238362432.

The previous prime is 251424659. The next prime is 251424673. The reversal of 251424661 is 166424152.

It is a happy number.

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

It is not a de Polignac number, because 251424661 - 2¹ = 251424659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251424631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45771 + ... + 50968.

It is an arithmetic number, because the mean of its divisors is an integer number (33085080).

Almost surely, 2^251424661 is an apocalyptic number.

It is an amenable number.

251424661 is a deficient number, since it is larger than the sum of its proper divisors (13255979).

251424661 is a wasteful number, since it uses less digits than its factorization.

251424661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96875.

The product of its digits is 11520, while the sum is 31.

The square root of 251424661 is about 15856.3760361566. The cubic root of 251424661 is about 631.1548992962.

The spelling of 251424661 in words is "two hundred fifty-one million, four hundred twenty-four thousand, six hundred sixty-one".