83977831 has 4 divisors (see below), whose sum is σ = 95974672. Its totient is φ = 71980992.

The previous prime is 83977781. The next prime is 83977889. The reversal of 83977831 is 13877938.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13877938 = 2 ⋅6938969.

It is a cyclic number.

It is not a de Polignac number, because 83977831 - 2¹⁵ = 83945063 is a prime.

It is a super-2 number, since 2×83977831² = 14104552198929122, 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 (83977631) 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, 5998410 + ... + 5998423.

It is an arithmetic number, because the mean of its divisors is an integer number (23993668).

Almost surely, 2^83977831 is an apocalyptic number.

83977831 is a deficient number, since it is larger than the sum of its proper divisors (11996841).

83977831 is a wasteful number, since it uses less digits than its factorization.

83977831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11996840.

The product of its digits is 254016, while the sum is 46.

The square root of 83977831 is about 9163.9418920026. The cubic root of 83977831 is about 437.9133829958.

The spelling of 83977831 in words is "eighty-three million, nine hundred seventy-seven thousand, eight hundred thirty-one".