156124991989 has 2 divisors, whose sum is σ = 156124991990. Its totient is φ = 156124991988.

The previous prime is 156124991951. The next prime is 156124992007. The reversal of 156124991989 is 989199421651.

156124991989 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., 146008052100 + 10116939889 = 382110^2 + 100583^2 .

It is a cyclic number.

It is not a de Polignac number, because 156124991989 - 2¹¹ = 156124989941 is a prime.

It is a super-2 number, since 2×156124991989² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 156124991989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156124991929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78062495994 + 78062495995.

It is an arithmetic number, because the mean of its divisors is an integer number (78062495995).

Almost surely, 2^156124991989 is an apocalyptic number.

It is an amenable number.

156124991989 is a deficient number, since it is larger than the sum of its proper divisors (1).

156124991989 is an equidigital number, since it uses as much as digits as its factorization.

156124991989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12597120, while the sum is 64.

The spelling of 156124991989 in words is "one hundred fifty-six billion, one hundred twenty-four million, nine hundred ninety-one thousand, nine hundred eighty-nine".