1990131 has 16 divisors (see below), whose sum is σ = 3118080. Its totient is φ = 1113120.

The previous prime is 1990123. The next prime is 1990133. The reversal of 1990131 is 1310991.

It is not a de Polignac number, because 1990131 - 2³ = 1990123 is a prime.

It is a super-2 number, since 2×1990131² = 7921242794322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1891 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (194880).

2^1990131 is an apocalyptic number.

1990131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1990131 is a deficient number, since it is larger than the sum of its proper divisors (1127949).

1990131 is a wasteful number, since it uses less digits than its factorization.

1990131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666.

The product of its (nonzero) digits is 243, while the sum is 24.

The square root of 1990131 is about 1410.7200289214. The cubic root of 1990131 is about 125.7845271692.

The spelling of 1990131 in words is "one million, nine hundred ninety thousand, one hundred thirty-one".