709427921 has 2 divisors, whose sum is σ = 709427922. Its totient is φ = 709427920.

The previous prime is 709427861. The next prime is 709428001. The reversal of 709427921 is 129724907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670240321 + 39187600 = 25889^2 + 6260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-709427921 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (709427321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354713960 + 354713961.

It is an arithmetic number, because the mean of its divisors is an integer number (354713961).

Almost surely, 2^709427921 is an apocalyptic number.

It is an amenable number.

709427921 is a deficient number, since it is larger than the sum of its proper divisors (1).

709427921 is an equidigital number, since it uses as much as digits as its factorization.

709427921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 709427921 is about 26635.0881545378. The cubic root of 709427921 is about 891.8724710768.

The spelling of 709427921 in words is "seven hundred nine million, four hundred twenty-seven thousand, nine hundred twenty-one".