83826781 has 2 divisors, whose sum is σ = 83826782. Its totient is φ = 83826780.

The previous prime is 83826739. The next prime is 83826839. The reversal of 83826781 is 18762838.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50993881 + 32832900 = 7141^2 + 5730^2 .

It is a cyclic number.

It is not a de Polignac number, because 83826781 - 2¹³ = 83818589 is a prime.

It is a super-2 number, since 2×83826781² = 14053858425643922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83826481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41913390 + 41913391.

It is an arithmetic number, because the mean of its divisors is an integer number (41913391).

Almost surely, 2^83826781 is an apocalyptic number.

It is an amenable number.

83826781 is a deficient number, since it is larger than the sum of its proper divisors (1).

83826781 is an equidigital number, since it uses as much as digits as its factorization.

83826781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 83826781 is about 9155.6966419820. The cubic root of 83826781 is about 437.6506687589.

The spelling of 83826781 in words is "eighty-three million, eight hundred twenty-six thousand, seven hundred eighty-one".