83812661 has 2 divisors, whose sum is σ = 83812662. Its totient is φ = 83812660.

The previous prime is 83812657. The next prime is 83812681. The reversal of 83812661 is 16621838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54316900 + 29495761 = 7370^2 + 5431^2 .

It is a cyclic number.

It is not a de Polignac number, because 83812661 - 2² = 83812657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83812681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41906330 + 41906331.

It is an arithmetic number, because the mean of its divisors is an integer number (41906331).

Almost surely, 2^83812661 is an apocalyptic number.

It is an amenable number.

83812661 is a deficient number, since it is larger than the sum of its proper divisors (1).

83812661 is an equidigital number, since it uses as much as digits as its factorization.

83812661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 83812661 is about 9154.9255048853. The cubic root of 83812661 is about 437.6260943752.

The spelling of 83812661 in words is "eighty-three million, eight hundred twelve thousand, six hundred sixty-one".