1990191059 has 4 divisors (see below), whose sum is σ = 2036474616. Its totient is φ = 1943907504.

The previous prime is 1990191031. The next prime is 1990191079. The reversal of 1990191059 is 9501910991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1990191059 - 2¹² = 1990186963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990191079) 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, 23141714 + ... + 23141799.

It is an arithmetic number, because the mean of its divisors is an integer number (509118654).

Almost surely, 2^1990191059 is an apocalyptic number.

1990191059 is a deficient number, since it is larger than the sum of its proper divisors (46283557).

1990191059 is an equidigital number, since it uses as much as digits as its factorization.

1990191059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46283556.

The product of its (nonzero) digits is 32805, while the sum is 44.

The square root of 1990191059 is about 44611.5574599229. The cubic root of 1990191059 is about 1257.8579248240.

The spelling of 1990191059 in words is "one billion, nine hundred ninety million, one hundred ninety-one thousand, fifty-nine".