99171019 has 2 divisors, whose sum is σ = 99171020. Its totient is φ = 99171018.

The previous prime is 99170941. The next prime is 99171041. The reversal of 99171019 is 91017199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99171019 - 2¹⁵ = 99138251 is a prime.

It is a super-2 number, since 2×99171019² = 19669782018996722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99171119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49585509 + 49585510.

It is an arithmetic number, because the mean of its divisors is an integer number (49585510).

Almost surely, 2^99171019 is an apocalyptic number.

99171019 is a deficient number, since it is larger than the sum of its proper divisors (1).

99171019 is an equidigital number, since it uses as much as digits as its factorization.

99171019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 37.

The square root of 99171019 is about 9958.4646909049. The cubic root of 99171019 is about 462.8727264705.

It can be divided in two parts, 991 and 71019, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 99171019 in words is "ninety-nine million, one hundred seventy-one thousand, nineteen".