129990797 has 2 divisors, whose sum is σ = 129990798. Its totient is φ = 129990796.

The previous prime is 129990743. The next prime is 129990811. The reversal of 129990797 is 797099921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69322276 + 60668521 = 8326^2 + 7789^2 .

It is a cyclic number.

It is not a de Polignac number, because 129990797 - 2²² = 125796493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129990727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64995398 + 64995399.

It is an arithmetic number, because the mean of its divisors is an integer number (64995399).

Almost surely, 2^129990797 is an apocalyptic number.

It is an amenable number.

129990797 is a deficient number, since it is larger than the sum of its proper divisors (1).

129990797 is an equidigital number, since it uses as much as digits as its factorization.

129990797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 642978, while the sum is 53.

The square root of 129990797 is about 11401.3506656010. The cubic root of 129990797 is about 506.5677476460.

The spelling of 129990797 in words is "one hundred twenty-nine million, nine hundred ninety thousand, seven hundred ninety-seven".