29991984397 has 2 divisors, whose sum is σ = 29991984398. Its totient is φ = 29991984396.

The previous prime is 29991984391. The next prime is 29991984427. The reversal of 29991984397 is 79348919992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27949486761 + 2042497636 = 167181^2 + 45194^2 .

It is a cyclic number.

It is not a de Polignac number, because 29991984397 - 2³ = 29991984389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29991984391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14995992198 + 14995992199.

It is an arithmetic number, because the mean of its divisors is an integer number (14995992199).

Almost surely, 2^29991984397 is an apocalyptic number.

It is an amenable number.

29991984397 is a deficient number, since it is larger than the sum of its proper divisors (1).

29991984397 is an equidigital number, since it uses as much as digits as its factorization.

29991984397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79361856, while the sum is 70.

The spelling of 29991984397 in words is "twenty-nine billion, nine hundred ninety-one million, nine hundred eighty-four thousand, three hundred ninety-seven".