83121431 has 4 divisors (see below), whose sum is σ = 83232864. Its totient is φ = 83010000.

The previous prime is 83121407. The next prime is 83121443. The reversal of 83121431 is 13412138.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83121431 is a prime.

It is a super-2 number, since 2×83121431² = 13818344582975522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83121397 and 83121406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83121491) 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, 54590 + ... + 56091.

It is an arithmetic number, because the mean of its divisors is an integer number (20808216).

Almost surely, 2^83121431 is an apocalyptic number.

83121431 is a deficient number, since it is larger than the sum of its proper divisors (111433).

83121431 is a wasteful number, since it uses less digits than its factorization.

83121431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111432.

The product of its digits is 576, while the sum is 23.

The square root of 83121431 is about 9117.0955353117. The cubic root of 83121431 is about 436.4196906382.

Adding to 83121431 its reverse (13412138), we get a palindrome (96533569).

The spelling of 83121431 in words is "eighty-three million, one hundred twenty-one thousand, four hundred thirty-one".