83128931 has 4 divisors (see below), whose sum is σ = 83936112. Its totient is φ = 82321752.

The previous prime is 83128921. The next prime is 83128939. The reversal of 83128931 is 13982138.

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

It is a cyclic number.

It is not a de Polignac number, because 83128931 - 2¹⁸ = 82866787 is a prime.

It is a super-2 number, since 2×83128931² = 13820838338405522, 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 = 83128891 and 83128900.

It is not an unprimeable number, because it can be changed into a prime (83128939) 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, 403436 + ... + 403641.

It is an arithmetic number, because the mean of its divisors is an integer number (20984028).

Almost surely, 2^83128931 is an apocalyptic number.

83128931 is a deficient number, since it is larger than the sum of its proper divisors (807181).

83128931 is a wasteful number, since it uses less digits than its factorization.

83128931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807180.

The product of its digits is 10368, while the sum is 35.

The square root of 83128931 is about 9117.5068412368. The cubic root of 83128931 is about 436.4328162112.

The spelling of 83128931 in words is "eighty-three million, one hundred twenty-eight thousand, nine hundred thirty-one".