81552001 has 8 divisors (see below), whose sum is σ = 83903040. Its totient is φ = 79231152.

The previous prime is 81551999. The next prime is 81552013. The reversal of 81552001 is 10025518.

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 81552001 - 2¹ = 81551999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81552061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2011 + ... + 12928.

It is an arithmetic number, because the mean of its divisors is an integer number (10487880).

Almost surely, 2^81552001 is an apocalyptic number.

It is an amenable number.

81552001 is a deficient number, since it is larger than the sum of its proper divisors (2351039).

81552001 is a wasteful number, since it uses less digits than its factorization.

81552001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15095.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 81552001 is about 9030.6146523922. The cubic root of 81552001 is about 433.6555149692.

Adding to 81552001 its reverse (10025518), we get a palindrome (91577519).

The spelling of 81552001 in words is "eighty-one million, five hundred fifty-two thousand, one".