990895901 has 2 divisors, whose sum is σ = 990895902. Its totient is φ = 990895900.

The previous prime is 990895891. The next prime is 990895907. The reversal of 990895901 is 109598099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931836676 + 59059225 = 30526^2 + 7685^2 .

It is a cyclic number.

It is not a de Polignac number, because 990895901 - 2¹⁴ = 990879517 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990895901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990895907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495447950 + 495447951.

It is an arithmetic number, because the mean of its divisors is an integer number (495447951).

Almost surely, 2^990895901 is an apocalyptic number.

It is an amenable number.

990895901 is a deficient number, since it is larger than the sum of its proper divisors (1).

990895901 is an equidigital number, since it uses as much as digits as its factorization.

990895901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 50.

The square root of 990895901 is about 31478.4990271137. The cubic root of 990895901 is about 996.9560440670.

The spelling of 990895901 in words is "nine hundred ninety million, eight hundred ninety-five thousand, nine hundred one".