81964801 has 8 divisors (see below), whose sum is σ = 85751424. Its totient is φ = 78196800.

The previous prime is 81964777. The next prime is 81964807. The reversal of 81964801 is 10846918.

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 81964801 - 2¹¹ = 81962753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81964807) 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, 4780 + ... + 13666.

It is an arithmetic number, because the mean of its divisors is an integer number (10718928).

Almost surely, 2^81964801 is an apocalyptic number.

It is an amenable number.

81964801 is a deficient number, since it is larger than the sum of its proper divisors (3786623).

81964801 is a wasteful number, since it uses less digits than its factorization.

81964801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9311.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 81964801 is about 9053.4413898804. The cubic root of 81964801 is about 434.3859765078.

The spelling of 81964801 in words is "eighty-one million, nine hundred sixty-four thousand, eight hundred one".