1990584061 has 4 divisors (see below), whose sum is σ = 1991470624. Its totient is φ = 1989697500.

The previous prime is 1990584047. The next prime is 1990584083. The reversal of 1990584061 is 1604850991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990584061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1990583999 and 1990584017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990584031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439905 + ... + 444406.

It is an arithmetic number, because the mean of its divisors is an integer number (497867656).

Almost surely, 2^1990584061 is an apocalyptic number.

It is an amenable number.

1990584061 is a deficient number, since it is larger than the sum of its proper divisors (886563).

1990584061 is an equidigital number, since it uses as much as digits as its factorization.

1990584061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886562.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1990584061 is about 44615.9619530948. The cubic root of 1990584061 is about 1257.9407155595.

The spelling of 1990584061 in words is "one billion, nine hundred ninety million, five hundred eighty-four thousand, sixty-one".