157967209 has 2 divisors, whose sum is σ = 157967210. Its totient is φ = 157967208.

The previous prime is 157967191. The next prime is 157967231. The reversal of 157967209 is 902769751.

It is a happy number.

157967209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155077209 + 2890000 = 12453^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 157967209 - 2⁷ = 157967081 is a prime.

It is not a weakly prime, because it can be changed into another prime (157967279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78983604 + 78983605.

It is an arithmetic number, because the mean of its divisors is an integer number (78983605).

Almost surely, 2^157967209 is an apocalyptic number.

It is an amenable number.

157967209 is a deficient number, since it is larger than the sum of its proper divisors (1).

157967209 is an equidigital number, since it uses as much as digits as its factorization.

157967209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 157967209 is about 12568.5006663484. The cubic root of 157967209 is about 540.5746158131.

It can be divided in two parts, 15796 and 7209, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 157967209 in words is "one hundred fifty-seven million, nine hundred sixty-seven thousand, two hundred nine".