83981851 has 4 divisors (see below), whose sum is σ = 84075352. Its totient is φ = 83888352.

The previous prime is 83981837. The next prime is 83981861. The reversal of 83981851 is 15818938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15818938 = 2 ⋅7909469.

It is a cyclic number.

It is not a de Polignac number, because 83981851 - 2¹¹ = 83979803 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83981798 and 83981807.

It is not an unprimeable number, because it can be changed into a prime (83981801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45390 + ... + 47203.

It is an arithmetic number, because the mean of its divisors is an integer number (21018838).

Almost surely, 2^83981851 is an apocalyptic number.

83981851 is a deficient number, since it is larger than the sum of its proper divisors (93501).

83981851 is an equidigital number, since it uses as much as digits as its factorization.

83981851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93500.

The product of its digits is 69120, while the sum is 43.

The square root of 83981851 is about 9164.1612273028. The cubic root of 83981851 is about 437.9203704896.

The spelling of 83981851 in words is "eighty-three million, nine hundred eighty-one thousand, eight hundred fifty-one".