81214773 has 8 divisors (see below), whose sum is σ = 108573600. Its totient is φ = 53999568.

The previous prime is 81214769. The next prime is 81214801. The reversal of 81214773 is 37741218.

It is a happy number.

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

It is not a de Polignac number, because 81214773 - 2² = 81214769 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81214723) 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, 34578 + ... + 36851.

It is an arithmetic number, because the mean of its divisors is an integer number (13571700).

Almost surely, 2^81214773 is an apocalyptic number.

It is an amenable number.

81214773 is a deficient number, since it is larger than the sum of its proper divisors (27358827).

81214773 is a wasteful number, since it uses less digits than its factorization.

81214773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71811.

The product of its digits is 9408, while the sum is 33.

The square root of 81214773 is about 9011.9239344326. The cubic root of 81214773 is about 433.0569487400.

The spelling of 81214773 in words is "eighty-one million, two hundred fourteen thousand, seven hundred seventy-three".