1999654931 has 2 divisors, whose sum is σ = 1999654932. Its totient is φ = 1999654930.

The previous prime is 1999654913. The next prime is 1999654949. The reversal of 1999654931 is 1394569991.

Together with previous prime (1999654913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1999654913) and next prime (1999654949).

It is a cyclic number.

It is not a de Polignac number, because 1999654931 - 2²² = 1995460627 is a prime.

It is a super-2 number, since 2×1999654931² = 7997239686145229522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1999654901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999827465 + 999827466.

It is an arithmetic number, because the mean of its divisors is an integer number (999827466).

Almost surely, 2^1999654931 is an apocalyptic number.

1999654931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999654931 is an equidigital number, since it uses as much as digits as its factorization.

1999654931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2361960, while the sum is 56.

The square root of 1999654931 is about 44717.5013948678. The cubic root of 1999654931 is about 1259.8485857777.

The spelling of 1999654931 in words is "one billion, nine hundred ninety-nine million, six hundred fifty-four thousand, nine hundred thirty-one".