1019890031 has 2 divisors, whose sum is σ = 1019890032. Its totient is φ = 1019890030.

The previous prime is 1019890007. The next prime is 1019890033. The reversal of 1019890031 is 1300989101.

It is a strong prime.

It is an emirp because it is prime and its reverse (1300989101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1019890031 is a prime.

It is a super-2 number, since 2×1019890031² = 2080351350666361922, which contains 22 as substring.

Together with 1019890033, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1019890031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019890033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509945015 + 509945016.

It is an arithmetic number, because the mean of its divisors is an integer number (509945016).

Almost surely, 2^1019890031 is an apocalyptic number.

1019890031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019890031 is an equidigital number, since it uses as much as digits as its factorization.

1019890031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 1019890031 is about 31935.7171674600. The cubic root of 1019890031 is about 1006.5865326741.

The spelling of 1019890031 in words is "one billion, nineteen million, eight hundred ninety thousand, thirty-one".