1999995113 has 2 divisors, whose sum is σ = 1999995114. Its totient is φ = 1999995112.

The previous prime is 1999995079. The next prime is 1999995131. The reversal of 1999995113 is 3115999991.

Together with next prime (1999995131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1209091984 + 790903129 = 34772^2 + 28123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999995113 - 2¹⁶ = 1999929577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999995143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999997556 + 999997557.

It is an arithmetic number, because the mean of its divisors is an integer number (999997557).

Almost surely, 2^1999995113 is an apocalyptic number.

It is an amenable number.

1999995113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999995113 is an equidigital number, since it uses as much as digits as its factorization.

1999995113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 885735, while the sum is 56.

The square root of 1999995113 is about 44721.3049116414. The cubic root of 1999995113 is about 1259.9200236883.

The spelling of 1999995113 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-five thousand, one hundred thirteen".