83747681 has 2 divisors, whose sum is σ = 83747682. Its totient is φ = 83747680.

The previous prime is 83747659. The next prime is 83747683. The reversal of 83747681 is 18674738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63856081 + 19891600 = 7991^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 83747681 - 2¹⁸ = 83485537 is a prime.

It is a super-2 number, since 2×83747681² = 14027348145755522, which contains 22 as substring.

Together with 83747683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83747683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41873840 + 41873841.

It is an arithmetic number, because the mean of its divisors is an integer number (41873841).

Almost surely, 2^83747681 is an apocalyptic number.

It is an amenable number.

83747681 is a deficient number, since it is larger than the sum of its proper divisors (1).

83747681 is an equidigital number, since it uses as much as digits as its factorization.

83747681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 44.

The square root of 83747681 is about 9151.3759074797. The cubic root of 83747681 is about 437.5129678877.

The spelling of 83747681 in words is "eighty-three million, seven hundred forty-seven thousand, six hundred eighty-one".