70394509 has 2 divisors, whose sum is σ = 70394510. Its totient is φ = 70394508.

The previous prime is 70394503. The next prime is 70394531. The reversal of 70394509 is 90549307.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 30008484 = 6355^2 + 5478^2 .

It is a cyclic number.

It is not a de Polignac number, because 70394509 - 2⁵ = 70394477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70394503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35197254 + 35197255.

It is an arithmetic number, because the mean of its divisors is an integer number (35197255).

Almost surely, 2^70394509 is an apocalyptic number.

It is an amenable number.

70394509 is a deficient number, since it is larger than the sum of its proper divisors (1).

70394509 is an equidigital number, since it uses as much as digits as its factorization.

70394509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 70394509 is about 8390.1435625381. The cubic root of 70394509 is about 412.9013105812.

The spelling of 70394509 in words is "seventy million, three hundred ninety-four thousand, five hundred nine".