251540089 has 2 divisors, whose sum is σ = 251540090. Its totient is φ = 251540088.

The previous prime is 251540057. The next prime is 251540129. The reversal of 251540089 is 980045152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179426025 + 72114064 = 13395^2 + 8492^2 .

It is a cyclic number.

It is not a de Polignac number, because 251540089 - 2⁵ = 251540057 is a prime.

It is not a weakly prime, because it can be changed into another prime (251540189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125770044 + 125770045.

It is an arithmetic number, because the mean of its divisors is an integer number (125770045).

Almost surely, 2^251540089 is an apocalyptic number.

It is an amenable number.

251540089 is a deficient number, since it is larger than the sum of its proper divisors (1).

251540089 is an equidigital number, since it uses as much as digits as its factorization.

251540089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 251540089 is about 15860.0154161337. The cubic root of 251540089 is about 631.2514713687.

The spelling of 251540089 in words is "two hundred fifty-one million, five hundred forty thousand, eighty-nine".