81633001 has 8 divisors (see below), whose sum is σ = 83060640. Its totient is φ = 80211648.

The previous prime is 81632977. The next prime is 81633007. The reversal of 81633001 is 10033618.

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 81633001 - 2¹¹ = 81630953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81633007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29985 + ... + 32593.

It is an arithmetic number, because the mean of its divisors is an integer number (10382580).

Almost surely, 2^81633001 is an apocalyptic number.

It is an amenable number.

81633001 is a deficient number, since it is larger than the sum of its proper divisors (1427639).

81633001 is a wasteful number, since it uses less digits than its factorization.

81633001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 81633001 is about 9035.0982839148. The cubic root of 81633001 is about 433.7990408719.

Adding to 81633001 its reverse (10033618), we get a palindrome (91666619).

The spelling of 81633001 in words is "eighty-one million, six hundred thirty-three thousand, one".