81960901 has 8 divisors (see below), whose sum is σ = 90417600. Its totient is φ = 73671840.

The previous prime is 81960871. The next prime is 81960913. The reversal of 81960901 is 10906918.

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

It is not a de Polignac number, because 81960901 - 2⁷ = 81960773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81960401) 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, 40881 + ... + 42838.

It is an arithmetic number, because the mean of its divisors is an integer number (11302200).

Almost surely, 2^81960901 is an apocalyptic number.

It is an amenable number.

81960901 is a deficient number, since it is larger than the sum of its proper divisors (8456699).

81960901 is a wasteful number, since it uses less digits than its factorization.

81960901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83819.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 81960901 is about 9053.2259996092. The cubic root of 81960901 is about 434.3790868342.

The spelling of 81960901 in words is "eighty-one million, nine hundred sixty thousand, nine hundred one".