251450489 has 2 divisors, whose sum is σ = 251450490. Its totient is φ = 251450488.

The previous prime is 251450477. The next prime is 251450491. The reversal of 251450489 is 984054152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238548025 + 12902464 = 15445^2 + 3592^2 .

It is a cyclic number.

It is not a de Polignac number, because 251450489 - 2⁸ = 251450233 is a prime.

Together with 251450491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (251450189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125725244 + 125725245.

It is an arithmetic number, because the mean of its divisors is an integer number (125725245).

Almost surely, 2^251450489 is an apocalyptic number.

It is an amenable number.

251450489 is a deficient number, since it is larger than the sum of its proper divisors (1).

251450489 is an equidigital number, since it uses as much as digits as its factorization.

251450489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 251450489 is about 15857.1904510225. The cubic root of 251450489 is about 631.1765106880.

The spelling of 251450489 in words is "two hundred fifty-one million, four hundred fifty thousand, four hundred eighty-nine".