156097261 has 2 divisors, whose sum is σ = 156097262. Its totient is φ = 156097260.

The previous prime is 156097259. The next prime is 156097289. The reversal of 156097261 is 162790651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78322500 + 77774761 = 8850^2 + 8819^2 .

It is a cyclic number.

It is not a de Polignac number, because 156097261 - 2¹ = 156097259 is a prime.

Together with 156097259, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 156097261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156097241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78048630 + 78048631.

It is an arithmetic number, because the mean of its divisors is an integer number (78048631).

Almost surely, 2^156097261 is an apocalyptic number.

It is an amenable number.

156097261 is a deficient number, since it is larger than the sum of its proper divisors (1).

156097261 is an equidigital number, since it uses as much as digits as its factorization.

156097261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 156097261 is about 12493.8889462009. Note that the first 3 decimals coincide. The cubic root of 156097261 is about 538.4331133174.

The spelling of 156097261 in words is "one hundred fifty-six million, ninety-seven thousand, two hundred sixty-one".