1990011321 has 12 divisors (see below), whose sum is σ = 2980922672. Its totient is φ = 1326674052.

The previous prime is 1990011281. The next prime is 1990011337. The reversal of 1990011321 is 1231100991.

It is not a de Polignac number, because 1990011321 - 2¹³ = 1990003129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990011391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4094431 + ... + 4094916.

Almost surely, 2^1990011321 is an apocalyptic number.

It is an amenable number.

1990011321 is a deficient number, since it is larger than the sum of its proper divisors (990911351).

1990011321 is an frugal number, since it uses more digits than its factorization.

1990011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8189362 (or 8189350 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 1990011321 is about 44609.5429364615. The cubic root of 1990011321 is about 1257.8200571574.

The spelling of 1990011321 in words is "one billion, nine hundred ninety million, eleven thousand, three hundred twenty-one".