83691791 has 2 divisors, whose sum is σ = 83691792. Its totient is φ = 83691790.

The previous prime is 83691763. The next prime is 83691821. The reversal of 83691791 is 19719638.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83691791 - 2¹⁴ = 83675407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83691721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41845895 + 41845896.

It is an arithmetic number, because the mean of its divisors is an integer number (41845896).

Almost surely, 2^83691791 is an apocalyptic number.

83691791 is a deficient number, since it is larger than the sum of its proper divisors (1).

83691791 is an equidigital number, since it uses as much as digits as its factorization.

83691791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 83691791 is about 9148.3217586615. The cubic root of 83691791 is about 437.4156197539.

The spelling of 83691791 in words is "eighty-three million, six hundred ninety-one thousand, seven hundred ninety-one".