709521121 has 2 divisors, whose sum is σ = 709521122. Its totient is φ = 709521120.

The previous prime is 709521119. The next prime is 709521193. The reversal of 709521121 is 121125907.

709521121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 561168721 + 148352400 = 23689^2 + 12180^2 .

It is a cyclic number.

It is not a de Polignac number, because 709521121 - 2¹ = 709521119 is a prime.

It is a super-2 number, since 2×709521121² = 1006840442290193282, which contains 22 as substring.

Together with 709521119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 709521121.

It is not a weakly prime, because it can be changed into another prime (707521121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354760560 + 354760561.

It is an arithmetic number, because the mean of its divisors is an integer number (354760561).

Almost surely, 2^709521121 is an apocalyptic number.

It is an amenable number.

709521121 is a deficient number, since it is larger than the sum of its proper divisors (1).

709521121 is an equidigital number, since it uses as much as digits as its factorization.

709521121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 709521121 is about 26636.8376689126. The cubic root of 709521121 is about 891.9115254905.

The spelling of 709521121 in words is "seven hundred nine million, five hundred twenty-one thousand, one hundred twenty-one".