129620819 has 2 divisors, whose sum is σ = 129620820. Its totient is φ = 129620818.

The previous prime is 129620779. The next prime is 129620833. The reversal of 129620819 is 918026921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129620819 - 2¹² = 129616723 is a prime.

It is a super-2 number, since 2×129620819² = 33603113436461522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129620849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64810409 + 64810410.

It is an arithmetic number, because the mean of its divisors is an integer number (64810410).

Almost surely, 2^129620819 is an apocalyptic number.

129620819 is a deficient number, since it is larger than the sum of its proper divisors (1).

129620819 is an equidigital number, since it uses as much as digits as its factorization.

129620819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 129620819 is about 11385.1139212570. The cubic root of 129620819 is about 506.0866956077.

The spelling of 129620819 in words is "one hundred twenty-nine million, six hundred twenty thousand, eight hundred nineteen".