156970013 has 4 divisors (see below), whose sum is σ = 157969980. Its totient is φ = 155970048.

The previous prime is 156970007. The next prime is 156970063. The reversal of 156970013 is 310079651.

156970013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96098809 + 60871204 = 9803^2 + 7802^2 .

It is a cyclic number.

It is not a de Polignac number, because 156970013 - 2⁴ = 156969997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156970063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499748 + ... + 500061.

It is an arithmetic number, because the mean of its divisors is an integer number (39492495).

Almost surely, 2^156970013 is an apocalyptic number.

It is an amenable number.

156970013 is a deficient number, since it is larger than the sum of its proper divisors (999967).

156970013 is an equidigital number, since it uses as much as digits as its factorization.

156970013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999966.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 156970013 is about 12528.7674174278. The cubic root of 156970013 is about 539.4347228265.

The spelling of 156970013 in words is "one hundred fifty-six million, nine hundred seventy thousand, thirteen".