29991459809 has 2 divisors, whose sum is σ = 29991459810. Its totient is φ = 29991459808.

The previous prime is 29991459803. The next prime is 29991459877. The reversal of 29991459809 is 90895419992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17411594209 + 12579865600 = 131953^2 + 112160^2 .

It is a cyclic number.

It is not a de Polignac number, because 29991459809 - 2²⁴ = 29974682593 is a prime.

It is a super-2 number, since 2×29991459809² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (29991459803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995729904 + 14995729905.

It is an arithmetic number, because the mean of its divisors is an integer number (14995729905).

Almost surely, 2^29991459809 is an apocalyptic number.

It is an amenable number.

29991459809 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991459809 is an equidigital number, since it uses as much as digits as its factorization.

29991459809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18895680, while the sum is 65.

The spelling of 29991459809 in words is "twenty-nine billion, nine hundred ninety-one million, four hundred fifty-nine thousand, eight hundred nine".