129858997 has 2 divisors, whose sum is σ = 129858998. Its totient is φ = 129858996.

The previous prime is 129858991. The next prime is 129859019. The reversal of 129858997 is 799858921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91987281 + 37871716 = 9591^2 + 6154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129858997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129858991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64929498 + 64929499.

It is an arithmetic number, because the mean of its divisors is an integer number (64929499).

Almost surely, 2^129858997 is an apocalyptic number.

It is an amenable number.

129858997 is a deficient number, since it is larger than the sum of its proper divisors (1).

129858997 is an equidigital number, since it uses as much as digits as its factorization.

129858997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 58.

The square root of 129858997 is about 11395.5691828008. The cubic root of 129858997 is about 506.3964837094.

The spelling of 129858997 in words is "one hundred twenty-nine million, eight hundred fifty-eight thousand, nine hundred ninety-seven".