251484421 has 2 divisors, whose sum is σ = 251484422. Its totient is φ = 251484420.

The previous prime is 251484403. The next prime is 251484479. The reversal of 251484421 is 124484152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169780900 + 81703521 = 13030^2 + 9039^2 .

It is a cyclic number.

It is not a de Polignac number, because 251484421 - 2¹¹ = 251482373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251484521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125742210 + 125742211.

It is an arithmetic number, because the mean of its divisors is an integer number (125742211).

Almost surely, 2^251484421 is an apocalyptic number.

It is an amenable number.

251484421 is a deficient number, since it is larger than the sum of its proper divisors (1).

251484421 is an equidigital number, since it uses as much as digits as its factorization.

251484421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10240, while the sum is 31.

The square root of 251484421 is about 15858.2603396463. The cubic root of 251484421 is about 631.2049007939.

The spelling of 251484421 in words is "two hundred fifty-one million, four hundred eighty-four thousand, four hundred twenty-one".