29986991 has 2 divisors, whose sum is σ = 29986992. Its totient is φ = 29986990.

The previous prime is 29986981. The next prime is 29986993. The reversal of 29986991 is 19968992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 29986991 - 2¹⁸ = 29724847 is a prime.

It is a Sophie Germain prime.

Together with 29986993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29986993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14993495 + 14993496.

It is an arithmetic number, because the mean of its divisors is an integer number (14993496).

Almost surely, 2^29986991 is an apocalyptic number.

29986991 is a deficient number, since it is larger than the sum of its proper divisors (1).

29986991 is an equidigital number, since it uses as much as digits as its factorization.

29986991 is an odious number, because the sum of its binary digits is odd.

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

The square root of 29986991 is about 5476.0378924912. The cubic root of 29986991 is about 310.6783307822.

The spelling of 29986991 in words is "twenty-nine million, nine hundred eighty-six thousand, nine hundred ninety-one".