83949181 has 4 divisors (see below), whose sum is σ = 85996764. Its totient is φ = 81901600.

The previous prime is 83949167. The next prime is 83949227. The reversal of 83949181 is 18194938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18194938 = 2 ⋅9097469.

It can be written as a sum of positive squares in 2 ways, for example, as 19404025 + 64545156 = 4405^2 + 8034^2 .

It is not a de Polignac number, because 83949181 - 2¹¹ = 83947133 is a prime.

It is a super-2 number, since 2×83949181² = 14094929981141522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83949101) 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, 1023730 + ... + 1023811.

It is an arithmetic number, because the mean of its divisors is an integer number (21499191).

Almost surely, 2^83949181 is an apocalyptic number.

It is an amenable number.

83949181 is a deficient number, since it is larger than the sum of its proper divisors (2047583).

83949181 is a wasteful number, since it uses less digits than its factorization.

83949181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2047582.

The product of its digits is 62208, while the sum is 43.

The square root of 83949181 is about 9162.3785667260. The cubic root of 83949181 is about 437.8635776075.

The spelling of 83949181 in words is "eighty-three million, nine hundred forty-nine thousand, one hundred eighty-one".