1990790901 has 48 divisors (see below), whose sum is σ = 3200476032. Its totient is φ = 1182384000.

The previous prime is 1990790833. The next prime is 1990790903. The reversal of 1990790901 is 1090970991.

It is not a de Polignac number, because 1990790901 - 2¹³ = 1990782709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990790903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1028931 + ... + 1030863.

It is an arithmetic number, because the mean of its divisors is an integer number (66676584).

Almost surely, 2^1990790901 is an apocalyptic number.

1990790901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1990790901 is a deficient number, since it is larger than the sum of its proper divisors (1209685131).

1990790901 is a wasteful number, since it uses less digits than its factorization.

1990790901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154 (or 2151 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 1990790901 is about 44618.2798973694. The cubic root of 1990790901 is about 1257.9842845888.

The spelling of 1990790901 in words is "one billion, nine hundred ninety million, seven hundred ninety thousand, nine hundred one".