2115999989 has 2 divisors, whose sum is σ = 2115999990. Its totient is φ = 2115999988.

The previous prime is 2115999983. The next prime is 2116000021. The reversal of 2115999989 is 9899995112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1194877489 + 921122500 = 34567^2 + 30350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115999989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2115999983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057999994 + 1057999995.

It is an arithmetic number, because the mean of its divisors is an integer number (1057999995).

Almost surely, 2^2115999989 is an apocalyptic number.

It is an amenable number.

2115999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115999989 is an equidigital number, since it uses as much as digits as its factorization.

2115999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4723920, while the sum is 62.

The square root of 2115999989 is about 45999.9998804348. Note that the first 3 decimals coincide. The cubic root of 2115999989 is about 1283.8232023745.

The spelling of 2115999989 in words is "two billion, one hundred fifteen million, nine hundred ninety-nine thousand, nine hundred eighty-nine".