1990902293 has 2 divisors, whose sum is σ = 1990902294. Its totient is φ = 1990902292.

The previous prime is 1990902271. The next prime is 1990902337. The reversal of 1990902293 is 3922090991.

It is an a-pointer prime, because the next prime (1990902337) can be obtained adding 1990902293 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1824827524 + 166074769 = 42718^2 + 12887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990902293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990902493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995451146 + 995451147.

It is an arithmetic number, because the mean of its divisors is an integer number (995451147).

Almost surely, 2^1990902293 is an apocalyptic number.

It is an amenable number.

1990902293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990902293 is an equidigital number, since it uses as much as digits as its factorization.

1990902293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 1990902293 is about 44619.5281575231. The cubic root of 1990902293 is about 1258.0077470850.

The spelling of 1990902293 in words is "one billion, nine hundred ninety million, nine hundred two thousand, two hundred ninety-three".