156430121 has 2 divisors, whose sum is σ = 156430122. Its totient is φ = 156430120.

The previous prime is 156430093. The next prime is 156430139. The reversal of 156430121 is 121034651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129504400 + 26925721 = 11380^2 + 5189^2 .

It is an emirp because it is prime and its reverse (121034651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156430121 - 2²² = 152235817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (156400121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78215060 + 78215061.

It is an arithmetic number, because the mean of its divisors is an integer number (78215061).

Almost surely, 2^156430121 is an apocalyptic number.

It is an amenable number.

156430121 is a deficient number, since it is larger than the sum of its proper divisors (1).

156430121 is an equidigital number, since it uses as much as digits as its factorization.

156430121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 156430121 is about 12507.2027648072. The cubic root of 156430121 is about 538.8155577941.

Adding to 156430121 its reverse (121034651), we get a palindrome (277464772).

The spelling of 156430121 in words is "one hundred fifty-six million, four hundred thirty thousand, one hundred twenty-one".