29913209 has 2 divisors, whose sum is σ = 29913210. Its totient is φ = 29913208.

The previous prime is 29913173. The next prime is 29913211. The reversal of 29913209 is 90231992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22090000 + 7823209 = 4700^2 + 2797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29913209 is a prime.

It is a Sophie Germain prime.

Together with 29913211, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (29913229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14956604 + 14956605.

It is an arithmetic number, because the mean of its divisors is an integer number (14956605).

Almost surely, 2^29913209 is an apocalyptic number.

It is an amenable number.

29913209 is a deficient number, since it is larger than the sum of its proper divisors (1).

29913209 is an equidigital number, since it uses as much as digits as its factorization.

29913209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 29913209 is about 5469.2969383642. The cubic root of 29913209 is about 310.4233169293.

The spelling of 29913209 in words is "twenty-nine million, nine hundred thirteen thousand, two hundred nine".