83747813 has 2 divisors, whose sum is σ = 83747814. Its totient is φ = 83747812.

The previous prime is 83747777. The next prime is 83747827. The reversal of 83747813 is 31874738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80586529 + 3161284 = 8977^2 + 1778^2 .

It is a cyclic number.

It is not a de Polignac number, because 83747813 - 2⁸ = 83747557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83747893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41873906 + 41873907.

It is an arithmetic number, because the mean of its divisors is an integer number (41873907).

Almost surely, 2^83747813 is an apocalyptic number.

It is an amenable number.

83747813 is a deficient number, since it is larger than the sum of its proper divisors (1).

83747813 is an equidigital number, since it uses as much as digits as its factorization.

83747813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 83747813 is about 9151.3831195071. The cubic root of 83747813 is about 437.5131977515.

The spelling of 83747813 in words is "eighty-three million, seven hundred forty-seven thousand, eight hundred thirteen".