156432161 has 2 divisors, whose sum is σ = 156432162. Its totient is φ = 156432160.

The previous prime is 156432139. The next prime is 156432163. The reversal of 156432161 is 161234651.

It is a happy number.

156432161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85451536 + 70980625 = 9244^2 + 8425^2 .

It is a cyclic number.

It is not a de Polignac number, because 156432161 - 2¹⁰ = 156431137 is a prime.

It is a Sophie Germain prime.

Together with 156432163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (156432163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78216080 + 78216081.

It is an arithmetic number, because the mean of its divisors is an integer number (78216081).

Almost surely, 2^156432161 is an apocalyptic number.

It is an amenable number.

156432161 is a deficient number, since it is larger than the sum of its proper divisors (1).

156432161 is an equidigital number, since it uses as much as digits as its factorization.

156432161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 156432161 is about 12507.2843175487. The cubic root of 156432161 is about 538.8179000091.

The spelling of 156432161 in words is "one hundred fifty-six million, four hundred thirty-two thousand, one hundred sixty-one".