156019949 has 2 divisors, whose sum is σ = 156019950. Its totient is φ = 156019948.

The previous prime is 156019933. The next prime is 156019957. The reversal of 156019949 is 949910651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153313924 + 2706025 = 12382^2 + 1645^2 .

It is an emirp because it is prime and its reverse (949910651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156019949 - 2⁴ = 156019933 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156019909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78009974 + 78009975.

It is an arithmetic number, because the mean of its divisors is an integer number (78009975).

Almost surely, 2^156019949 is an apocalyptic number.

It is an amenable number.

156019949 is a deficient number, since it is larger than the sum of its proper divisors (1).

156019949 is an equidigital number, since it uses as much as digits as its factorization.

156019949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 156019949 is about 12490.7945704026. The cubic root of 156019949 is about 538.3442067496.

The spelling of 156019949 in words is "one hundred fifty-six million, nineteen thousand, nine hundred forty-nine".