81354751 has 8 divisors (see below), whose sum is σ = 85745520. Its totient is φ = 76974912.

The previous prime is 81354743. The next prime is 81354761. The reversal of 81354751 is 15745318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81354751 - 2³ = 81354743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81354761) 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, 15861 + ... + 20353.

It is an arithmetic number, because the mean of its divisors is an integer number (10718190).

Almost surely, 2^81354751 is an apocalyptic number.

81354751 is a deficient number, since it is larger than the sum of its proper divisors (4390769).

81354751 is a wasteful number, since it uses less digits than its factorization.

81354751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465.

The product of its digits is 16800, while the sum is 34.

The square root of 81354751 is about 9019.6868570921. The cubic root of 81354751 is about 433.3056048661.

The spelling of 81354751 in words is "eighty-one million, three hundred fifty-four thousand, seven hundred fifty-one".