251654401 has 4 divisors (see below), whose sum is σ = 251824900. Its totient is φ = 251483904.

The previous prime is 251654399. The next prime is 251654419. The reversal of 251654401 is 104456152.

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 77018176 + 174636225 = 8776^2 + 13215^2 .

It is a cyclic number.

It is not a de Polignac number, because 251654401 - 2¹ = 251654399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251654401.

It is not an unprimeable number, because it can be changed into a prime (251654101) 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 3 ways as a sum of consecutive naturals, for example, 83016 + ... + 85993.

It is an arithmetic number, because the mean of its divisors is an integer number (62956225).

Almost surely, 2^251654401 is an apocalyptic number.

It is an amenable number.

251654401 is a deficient number, since it is larger than the sum of its proper divisors (170499).

251654401 is a wasteful number, since it uses less digits than its factorization.

251654401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170498.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 251654401 is about 15863.6187863930. The cubic root of 251654401 is about 631.3470806349.

The spelling of 251654401 in words is "two hundred fifty-one million, six hundred fifty-four thousand, four hundred one".