81426961 has 8 divisors (see below), whose sum is σ = 101519424. Its totient is φ = 63449520.

The previous prime is 81426937. The next prime is 81426971. The reversal of 81426961 is 16962418.

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 81426961 - 2²³ = 73038353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81426961.

It is not an unprimeable number, because it can be changed into a prime (81426931) 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, 528670 + ... + 528823.

It is an arithmetic number, because the mean of its divisors is an integer number (12689928).

Almost surely, 2^81426961 is an apocalyptic number.

It is an amenable number.

81426961 is a deficient number, since it is larger than the sum of its proper divisors (20092463).

81426961 is a wasteful number, since it uses less digits than its factorization.

81426961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057511.

The product of its digits is 20736, while the sum is 37.

The square root of 81426961 is about 9023.6888798318. The cubic root of 81426961 is about 433.4337667931.

The spelling of 81426961 in words is "eighty-one million, four hundred twenty-six thousand, nine hundred sixty-one".