1990481 has 2 divisors, whose sum is σ = 1990482. Its totient is φ = 1990480.

The previous prime is 1990463. The next prime is 1990487. The reversal of 1990481 is 1840991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1890625 + 99856 = 1375^2 + 316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990481 is a prime.

It is a super-2 number, since 2×1990481² = 7924029222722, which contains 22 as substring.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1990487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995240 + 995241.

It is an arithmetic number, because the mean of its divisors is an integer number (995241).

2^1990481 is an apocalyptic number.

It is an amenable number.

1990481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990481 is an equidigital number, since it uses as much as digits as its factorization.

1990481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 1990481 is about 1410.8440735957. The cubic root of 1990481 is about 125.7919005538.

The spelling of 1990481 in words is "one million, nine hundred ninety thousand, four hundred eighty-one".