1999926931 has 2 divisors, whose sum is σ = 1999926932. Its totient is φ = 1999926930.

The previous prime is 1999926917. The next prime is 1999926979. The reversal of 1999926931 is 1396299991.

It is a weak prime.

It is an emirp because it is prime and its reverse (1396299991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999926931 is a prime.

It is a super-2 number, since 2×1999926931² = 7999415458678157522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1999926991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999963465 + 999963466.

It is an arithmetic number, because the mean of its divisors is an integer number (999963466).

Almost surely, 2^1999926931 is an apocalyptic number.

1999926931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999926931 is an equidigital number, since it uses as much as digits as its factorization.

1999926931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2125764, while the sum is 58.

The square root of 1999926931 is about 44720.5426062788. The cubic root of 1999926931 is about 1259.9057061795.

The spelling of 1999926931 in words is "one billion, nine hundred ninety-nine million, nine hundred twenty-six thousand, nine hundred thirty-one".