709191089 has 2 divisors, whose sum is σ = 709191090. Its totient is φ = 709191088.

The previous prime is 709191059. The next prime is 709191107. The reversal of 709191089 is 980191907.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 705805489 + 3385600 = 26567^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-709191089 is a prime.

It is not a weakly prime, because it can be changed into another prime (709191059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354595544 + 354595545.

It is an arithmetic number, because the mean of its divisors is an integer number (354595545).

Almost surely, 2^709191089 is an apocalyptic number.

It is an amenable number.

709191089 is a deficient number, since it is larger than the sum of its proper divisors (1).

709191089 is an equidigital number, since it uses as much as digits as its factorization.

709191089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 709191089 is about 26630.6419186620. The cubic root of 709191089 is about 891.7732138942.

The spelling of 709191089 in words is "seven hundred nine million, one hundred ninety-one thousand, eighty-nine".