81774933 has 4 divisors (see below), whose sum is σ = 109033248. Its totient is φ = 54516620.

The previous prime is 81774929. The next prime is 81774943. The reversal of 81774933 is 33947718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81774933 - 2² = 81774929 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81774943) 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, 13629153 + ... + 13629158.

It is an arithmetic number, because the mean of its divisors is an integer number (27258312).

Almost surely, 2^81774933 is an apocalyptic number.

It is an amenable number.

81774933 is a deficient number, since it is larger than the sum of its proper divisors (27258315).

81774933 is a wasteful number, since it uses less digits than its factorization.

81774933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27258314.

The product of its digits is 127008, while the sum is 42.

The square root of 81774933 is about 9042.9493529490. The cubic root of 81774933 is about 434.0503049280.

The spelling of 81774933 in words is "eighty-one million, seven hundred seventy-four thousand, nine hundred thirty-three".