29681999 has 2 divisors, whose sum is σ = 29682000. Its totient is φ = 29681998.

The previous prime is 29681989. The next prime is 29682011. The reversal of 29681999 is 99918692.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29681999 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29681999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29681989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14840999 + 14841000.

It is an arithmetic number, because the mean of its divisors is an integer number (14841000).

Almost surely, 2^29681999 is an apocalyptic number.

29681999 is a deficient number, since it is larger than the sum of its proper divisors (1).

29681999 is an equidigital number, since it uses as much as digits as its factorization.

29681999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 53.

The square root of 29681999 is about 5448.1188496581. The cubic root of 29681999 is about 309.6214560854.

The spelling of 29681999 in words is "twenty-nine million, six hundred eighty-one thousand, nine hundred ninety-nine".