1990031 has 2 divisors, whose sum is σ = 1990032. Its totient is φ = 1990030.

The previous prime is 1990007. The next prime is 1990033. The reversal of 1990031 is 1300991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1990031 - 2¹⁰ = 1989007 is a prime.

It is a super-2 number, since 2×1990031² = 7920446761922, which contains 22 as substring.

Together with 1990033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1989979 and 1990006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995015 + 995016.

It is an arithmetic number, because the mean of its divisors is an integer number (995016).

2^1990031 is an apocalyptic number.

1990031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990031 is an equidigital number, since it uses as much as digits as its factorization.

1990031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 1990031 is about 1410.6845855825. The cubic root of 1990031 is about 125.7824203291.

The spelling of 1990031 in words is "one million, nine hundred ninety thousand, thirty-one".