29991384431 has 2 divisors, whose sum is σ = 29991384432. Its totient is φ = 29991384430.

The previous prime is 29991384427. The next prime is 29991384457. The reversal of 29991384431 is 13448319992.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 29991384431 - 2² = 29991384427 is a prime.

It is a super-2 number, since 2×29991384431² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29991384331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995692215 + 14995692216.

It is an arithmetic number, because the mean of its divisors is an integer number (14995692216).

Almost surely, 2^29991384431 is an apocalyptic number.

29991384431 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991384431 is an equidigital number, since it uses as much as digits as its factorization.

29991384431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 53.

The spelling of 29991384431 in words is "twenty-nine billion, nine hundred ninety-one million, three hundred eighty-four thousand, four hundred thirty-one".