156845081 has 2 divisors, whose sum is σ = 156845082. Its totient is φ = 156845080.

The previous prime is 156845053. The next prime is 156845083. The reversal of 156845081 is 180548651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150798400 + 6046681 = 12280^2 + 2459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156845081 is a prime.

It is a super-2 number, since 2×156845081² = 49200758867793122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 156845083, 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 (156845083) 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, 78422540 + 78422541.

It is an arithmetic number, because the mean of its divisors is an integer number (78422541).

Almost surely, 2^156845081 is an apocalyptic number.

It is an amenable number.

156845081 is a deficient number, since it is larger than the sum of its proper divisors (1).

156845081 is an equidigital number, since it uses as much as digits as its factorization.

156845081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 156845081 is about 12523.7806192859. The cubic root of 156845081 is about 539.2915733068.

The spelling of 156845081 in words is "one hundred fifty-six million, eight hundred forty-five thousand, eighty-one".