17991793229 has 2 divisors, whose sum is σ = 17991793230. Its totient is φ = 17991793228.

The previous prime is 17991793187. The next prime is 17991793279. The reversal of 17991793229 is 92239719971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17819580100 + 172213129 = 133490^2 + 13123^2 .

It is a cyclic number.

It is not a de Polignac number, because 17991793229 - 2¹² = 17991789133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17991793279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8995896614 + 8995896615.

It is an arithmetic number, because the mean of its divisors is an integer number (8995896615).

Almost surely, 2^17991793229 is an apocalyptic number.

It is an amenable number.

17991793229 is a deficient number, since it is larger than the sum of its proper divisors (1).

17991793229 is an equidigital number, since it uses as much as digits as its factorization.

17991793229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3857868, while the sum is 59.

The spelling of 17991793229 in words is "seventeen billion, nine hundred ninety-one million, seven hundred ninety-three thousand, two hundred twenty-nine".