156949997 has 2 divisors, whose sum is σ = 156949998. Its totient is φ = 156949996.

The previous prime is 156949913. The next prime is 156950023. The reversal of 156949997 is 799949651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124300201 + 32649796 = 11149^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 156949997 - 2²⁶ = 89841133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156949697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78474998 + 78474999.

It is an arithmetic number, because the mean of its divisors is an integer number (78474999).

Almost surely, 2^156949997 is an apocalyptic number.

It is an amenable number.

156949997 is a deficient number, since it is larger than the sum of its proper divisors (1).

156949997 is an equidigital number, since it uses as much as digits as its factorization.

156949997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5511240, while the sum is 59.

The square root of 156949997 is about 12527.9685903182. The cubic root of 156949997 is about 539.4117932147.

The spelling of 156949997 in words is "one hundred fifty-six million, nine hundred forty-nine thousand, nine hundred ninety-seven".