1990559771 has 8 divisors (see below), whose sum is σ = 2086425600. Its totient is φ = 1895470632.

The previous prime is 1990559731. The next prime is 1990559783. The reversal of 1990559771 is 1779550991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1990559771 - 2²² = 1986365467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990559731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188921 + ... + 199178.

It is an arithmetic number, because the mean of its divisors is an integer number (260803200).

Almost surely, 2^1990559771 is an apocalyptic number.

1990559771 is a deficient number, since it is larger than the sum of its proper divisors (95865829).

1990559771 is a wasteful number, since it uses less digits than its factorization.

1990559771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388345.

The product of its (nonzero) digits is 893025, while the sum is 53.

The square root of 1990559771 is about 44615.6897402696. The cubic root of 1990559771 is about 1257.9355988863.

The spelling of 1990559771 in words is "one billion, nine hundred ninety million, five hundred fifty-nine thousand, seven hundred seventy-one".