99071989 has 2 divisors, whose sum is σ = 99071990. Its totient is φ = 99071988.

The previous prime is 99071963. The next prime is 99072007. The reversal of 99071989 is 98917099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64673764 + 34398225 = 8042^2 + 5865^2 .

It is a cyclic number.

It is not a de Polignac number, because 99071989 - 2¹¹ = 99069941 is a prime.

It is a super-2 number, since 2×99071989² = 19630518008832242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99071389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49535994 + 49535995.

It is an arithmetic number, because the mean of its divisors is an integer number (49535995).

Almost surely, 2^99071989 is an apocalyptic number.

It is an amenable number.

99071989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99071989 is an equidigital number, since it uses as much as digits as its factorization.

99071989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 99071989 is about 9953.4912970274. The cubic root of 99071989 is about 462.7186036473.

The spelling of 99071989 in words is "ninety-nine million, seventy-one thousand, nine hundred eighty-nine".