83781331 has 4 divisors (see below), whose sum is σ = 83990664. Its totient is φ = 83572000.

The previous prime is 83781311. The next prime is 83781337. The reversal of 83781331 is 13318738.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13318738 = 2 ⋅6659369.

It is a cyclic number.

It is not a de Polignac number, because 83781331 - 2²¹ = 81684179 is a prime.

It is a super-2 number, since 2×83781331² = 14038622848263122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83781337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104065 + ... + 104866.

It is an arithmetic number, because the mean of its divisors is an integer number (20997666).

Almost surely, 2^83781331 is an apocalyptic number.

83781331 is a deficient number, since it is larger than the sum of its proper divisors (209333).

83781331 is a wasteful number, since it uses less digits than its factorization.

83781331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209332.

The product of its digits is 12096, while the sum is 34.

The square root of 83781331 is about 9153.2142441877. The cubic root of 83781331 is about 437.5715579279.

The spelling of 83781331 in words is "eighty-three million, seven hundred eighty-one thousand, three hundred thirty-one".