5919691681 has 2 divisors, whose sum is σ = 5919691682. Its totient is φ = 5919691680.

The previous prime is 5919691649. The next prime is 5919691697. The reversal of 5919691681 is 1861969195.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5532979456 + 386712225 = 74384^2 + 19665^2 .

It is a cyclic number.

It is not a de Polignac number, because 5919691681 - 2⁵ = 5919691649 is a prime.

It is a super-2 number, since 2×5919691681² = 70085499196201211522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5919691081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2959845840 + 2959845841.

It is an arithmetic number, because the mean of its divisors is an integer number (2959845841).

Almost surely, 2^5919691681 is an apocalyptic number.

It is an amenable number.

5919691681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5919691681 is an equidigital number, since it uses as much as digits as its factorization.

5919691681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 55.

The square root of 5919691681 is about 76939.5326279020. The cubic root of 5919691681 is about 1808.9769338220.

The spelling of 5919691681 in words is "five billion, nine hundred nineteen million, six hundred ninety-one thousand, six hundred eighty-one".