156420613 has 2 divisors, whose sum is σ = 156420614. Its totient is φ = 156420612.

The previous prime is 156420601. The next prime is 156420629. The reversal of 156420613 is 316024651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110628324 + 45792289 = 10518^2 + 6767^2 .

It is a cyclic number.

It is not a de Polignac number, because 156420613 - 2²¹ = 154323461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156420683) 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, 78210306 + 78210307.

It is an arithmetic number, because the mean of its divisors is an integer number (78210307).

Almost surely, 2^156420613 is an apocalyptic number.

It is an amenable number.

156420613 is a deficient number, since it is larger than the sum of its proper divisors (1).

156420613 is an equidigital number, since it uses as much as digits as its factorization.

156420613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 156420613 is about 12506.8226580535. The cubic root of 156420613 is about 538.8046409662.

The spelling of 156420613 in words is "one hundred fifty-six million, four hundred twenty thousand, six hundred thirteen".