1791965081 has 2 divisors, whose sum is σ = 1791965082. Its totient is φ = 1791965080.

The previous prime is 1791965041. The next prime is 1791965111. The reversal of 1791965081 is 1805691971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1282785856 + 509179225 = 35816^2 + 22565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1791965081 - 2¹⁸ = 1791702937 is a prime.

It is a super-2 number, since 2×1791965081² = 6422277703046673122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1791965041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895982540 + 895982541.

It is an arithmetic number, because the mean of its divisors is an integer number (895982541).

Almost surely, 2^1791965081 is an apocalyptic number.

It is an amenable number.

1791965081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791965081 is an equidigital number, since it uses as much as digits as its factorization.

1791965081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 47.

The square root of 1791965081 is about 42331.6085331044. The cubic root of 1791965081 is about 1214.6276992161.

The spelling of 1791965081 in words is "one billion, seven hundred ninety-one million, nine hundred sixty-five thousand, eighty-one".