99939742571 has 2 divisors, whose sum is σ = 99939742572. Its totient is φ = 99939742570.

The previous prime is 99939742517. The next prime is 99939742601. The reversal of 99939742571 is 17524793999.

Together with previous prime (99939742517) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99939742571 - 2¹⁸ = 99939480427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99939742498 and 99939742507.

It is not a weakly prime, because it can be changed into another prime (99939742471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49969871285 + 49969871286.

It is an arithmetic number, because the mean of its divisors is an integer number (49969871286).

Almost surely, 2^99939742571 is an apocalyptic number.

99939742571 is a deficient number, since it is larger than the sum of its proper divisors (1).

99939742571 is an equidigital number, since it uses as much as digits as its factorization.

99939742571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38578680, while the sum is 65.

The spelling of 99939742571 in words is "ninety-nine billion, nine hundred thirty-nine million, seven hundred forty-two thousand, five hundred seventy-one".