1990361 has 2 divisors, whose sum is σ = 1990362. Its totient is φ = 1990360.

The previous prime is 1990337. The next prime is 1990379. The reversal of 1990361 is 1630991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1123600 + 866761 = 1060^2 + 931^2 .

It is a cyclic number.

It is not a de Polignac number, because 1990361 - 2¹⁴ = 1973977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1990321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995180 + 995181.

It is an arithmetic number, because the mean of its divisors is an integer number (995181).

2^1990361 is an apocalyptic number.

It is an amenable number.

1990361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990361 is an equidigital number, since it uses as much as digits as its factorization.

1990361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1990361 is about 1410.8015452217. The cubic root of 1990361 is about 125.7893726336.

The spelling of 1990361 in words is "one million, nine hundred ninety thousand, three hundred sixty-one".