156321229 has 2 divisors, whose sum is σ = 156321230. Its totient is φ = 156321228.

The previous prime is 156321199. The next prime is 156321241. The reversal of 156321229 is 922123651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87048900 + 69272329 = 9330^2 + 8323^2 .

It is an emirp because it is prime and its reverse (922123651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156321229 - 2²³ = 147932621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 156321229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156321299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78160614 + 78160615.

It is an arithmetic number, because the mean of its divisors is an integer number (78160615).

Almost surely, 2^156321229 is an apocalyptic number.

It is an amenable number.

156321229 is a deficient number, since it is larger than the sum of its proper divisors (1).

156321229 is an equidigital number, since it uses as much as digits as its factorization.

156321229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 156321229 is about 12502.8488353655. The cubic root of 156321229 is about 538.6905044630.

It can be divided in two parts, 15632 and 1229, that added together give a palindrome (16861).

The spelling of 156321229 in words is "one hundred fifty-six million, three hundred twenty-one thousand, two hundred twenty-nine".