1999996931 has 2 divisors, whose sum is σ = 1999996932. Its totient is φ = 1999996930.

The previous prime is 1999996897. The next prime is 1999996949. The reversal of 1999996931 is 1396999991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1999996931 - 2¹⁸ = 1999734787 is a prime.

It is a super-2 number, since 2×1999996931² = 7999975448018837522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1999926931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999998465 + 999998466.

It is an arithmetic number, because the mean of its divisors is an integer number (999998466).

Almost surely, 2^1999996931 is an apocalyptic number.

1999996931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999996931 is an equidigital number, since it uses as much as digits as its factorization.

1999996931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9565938, while the sum is 65.

The square root of 1999996931 is about 44721.3252375195. The cubic root of 1999996931 is about 1259.9204054449.

The spelling of 1999996931 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-six thousand, nine hundred thirty-one".