81302961 has 8 divisors (see below), whose sum is σ = 108566784. Its totient is φ = 54120560.

The previous prime is 81302927. The next prime is 81302971. The reversal of 81302961 is 16920318.

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 81302961 - 2⁷ = 81302833 is a prime.

It is a super-2 number, since 2×81302961² = 13220342934735042, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81302911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17985 + ... + 22046.

It is an arithmetic number, because the mean of its divisors is an integer number (13570848).

Almost surely, 2^81302961 is an apocalyptic number.

It is an amenable number.

81302961 is a deficient number, since it is larger than the sum of its proper divisors (27263823).

81302961 is a wasteful number, since it uses less digits than its factorization.

81302961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40711.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 81302961 is about 9016.8154577988. The cubic root of 81302961 is about 433.2136386703.

The spelling of 81302961 in words is "eighty-one million, three hundred two thousand, nine hundred sixty-one".