1020103991 has 2 divisors, whose sum is σ = 1020103992. Its totient is φ = 1020103990.

The previous prime is 1020103961. The next prime is 1020104003. The reversal of 1020103991 is 1993010201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1020103991 - 2⁶ = 1020103927 is a prime.

It is a super-2 number, since 2×1020103991² = 2081224304908256162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1020103991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020103951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510051995 + 510051996.

It is an arithmetic number, because the mean of its divisors is an integer number (510051996).

Almost surely, 2^1020103991 is an apocalyptic number.

1020103991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020103991 is an equidigital number, since it uses as much as digits as its factorization.

1020103991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 1020103991 is about 31939.0668461056. The cubic root of 1020103991 is about 1006.6569174506.

The spelling of 1020103991 in words is "one billion, twenty million, one hundred three thousand, nine hundred ninety-one".