81677133 has 8 divisors (see below), whose sum is σ = 121003200. Its totient is φ = 54451404.

The previous prime is 81677131. The next prime is 81677147. The reversal of 81677133 is 33177618.

It is not a de Polignac number, because 81677133 - 2¹ = 81677131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81677131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1512513 + ... + 1512566.

It is an arithmetic number, because the mean of its divisors is an integer number (15125400).

Almost surely, 2^81677133 is an apocalyptic number.

It is an amenable number.

81677133 is a deficient number, since it is larger than the sum of its proper divisors (39326067).

81677133 is a wasteful number, since it uses less digits than its factorization.

81677133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3025088 (or 3025082 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 81677133 is about 9037.5402073794. The cubic root of 81677133 is about 433.8771995012.

It can be divided in two parts, 81677 and 133, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 81677133 in words is "eighty-one million, six hundred seventy-seven thousand, one hundred thirty-three".