1990895461 has 2 divisors, whose sum is σ = 1990895462. Its totient is φ = 1990895460.

The previous prime is 1990895453. The next prime is 1990895503. The reversal of 1990895461 is 1645980991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1176078436 + 814817025 = 34294^2 + 28545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990895461 - 2³ = 1990895453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1990895399 and 1990895408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990895441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995447730 + 995447731.

It is an arithmetic number, because the mean of its divisors is an integer number (995447731).

Almost surely, 2^1990895461 is an apocalyptic number.

It is an amenable number.

1990895461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990895461 is an equidigital number, since it uses as much as digits as its factorization.

1990895461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 52.

The square root of 1990895461 is about 44619.4515990504. The cubic root of 1990895461 is about 1258.0063080861.

The spelling of 1990895461 in words is "one billion, nine hundred ninety million, eight hundred ninety-five thousand, four hundred sixty-one".