81222801 has 8 divisors (see below), whose sum is σ = 118142304. Its totient is φ = 49225920.

The previous prime is 81222797. The next prime is 81222803. The reversal of 81222801 is 10822218.

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

It is not a de Polignac number, because 81222801 - 2² = 81222797 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81222803) 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, 1230616 + ... + 1230681.

It is an arithmetic number, because the mean of its divisors is an integer number (14767788).

Almost surely, 2^81222801 is an apocalyptic number.

It is an amenable number.

81222801 is a deficient number, since it is larger than the sum of its proper divisors (36919503).

81222801 is a wasteful number, since it uses less digits than its factorization.

81222801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461311.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 81222801 is about 9012.3693333107. The cubic root of 81222801 is about 433.0712173536.

The spelling of 81222801 in words is "eighty-one million, two hundred twenty-two thousand, eight hundred one".