29988991 has 2 divisors, whose sum is σ = 29988992. Its totient is φ = 29988990.

The previous prime is 29988989. The next prime is 29989009. The reversal of 29988991 is 19988992.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 29988991 - 2¹ = 29988989 is a prime.

Together with 29988989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29988971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14994495 + 14994496.

It is an arithmetic number, because the mean of its divisors is an integer number (14994496).

Almost surely, 2^29988991 is an apocalyptic number.

29988991 is a deficient number, since it is larger than the sum of its proper divisors (1).

29988991 is an equidigital number, since it uses as much as digits as its factorization.

29988991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 55.

The square root of 29988991 is about 5476.2205032303. The cubic root of 29988991 is about 310.6852375867.

Subtracting from 29988991 its reverse (19988992), we obtain a palindrome (9999999).

The spelling of 29988991 in words is "twenty-nine million, nine hundred eighty-eight thousand, nine hundred ninety-one".