990074861 has 2 divisors, whose sum is σ = 990074862. Its totient is φ = 990074860.

The previous prime is 990074843. The next prime is 990074873. The reversal of 990074861 is 168470099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 675012361 + 315062500 = 25981^2 + 17750^2 .

It is a cyclic number.

It is not a de Polignac number, because 990074861 - 2¹⁴ = 990058477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990074461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495037430 + 495037431.

It is an arithmetic number, because the mean of its divisors is an integer number (495037431).

Almost surely, 2^990074861 is an apocalyptic number.

It is an amenable number.

990074861 is a deficient number, since it is larger than the sum of its proper divisors (1).

990074861 is an equidigital number, since it uses as much as digits as its factorization.

990074861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 990074861 is about 31465.4550419980. The cubic root of 990074861 is about 996.6806142026.

The spelling of 990074861 in words is "nine hundred ninety million, seventy-four thousand, eight hundred sixty-one".