249519089 has 2 divisors, whose sum is σ = 249519090. Its totient is φ = 249519088.

The previous prime is 249518977. The next prime is 249519131. The reversal of 249519089 is 980915942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217120225 + 32398864 = 14735^2 + 5692^2 .

It is a cyclic number.

It is not a de Polignac number, because 249519089 - 2²⁰ = 248470513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249510089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124759544 + 124759545.

It is an arithmetic number, because the mean of its divisors is an integer number (124759545).

Almost surely, 2^249519089 is an apocalyptic number.

It is an amenable number.

249519089 is a deficient number, since it is larger than the sum of its proper divisors (1).

249519089 is an equidigital number, since it uses as much as digits as its factorization.

249519089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 249519089 is about 15796.1732391108. The cubic root of 249519089 is about 629.5563257301.

The spelling of 249519089 in words is "two hundred forty-nine million, five hundred nineteen thousand, eighty-nine".