249021089 has 2 divisors, whose sum is σ = 249021090. Its totient is φ = 249021088.

The previous prime is 249021077. The next prime is 249021103. The reversal of 249021089 is 980120942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174768400 + 74252689 = 13220^2 + 8617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249021089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249021589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124510544 + 124510545.

It is an arithmetic number, because the mean of its divisors is an integer number (124510545).

Almost surely, 2^249021089 is an apocalyptic number.

It is an amenable number.

249021089 is a deficient number, since it is larger than the sum of its proper divisors (1).

249021089 is an equidigital number, since it uses as much as digits as its factorization.

249021089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 249021089 is about 15780.4020544472. The cubic root of 249021089 is about 629.1372156987.

The spelling of 249021089 in words is "two hundred forty-nine million, twenty-one thousand, eighty-nine".