81913435 has 8 divisors (see below), whose sum is σ = 98451936. Its totient is φ = 65426880.

The previous prime is 81913421. The next prime is 81913451. The reversal of 81913435 is 53431918.

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

It is a de Polignac number, because none of the positive numbers 2^k-81913435 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 81913435.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9426 + ... + 15895.

It is an arithmetic number, because the mean of its divisors is an integer number (12306492).

Almost surely, 2^81913435 is an apocalyptic number.

81913435 is a deficient number, since it is larger than the sum of its proper divisors (16538501).

81913435 is a wasteful number, since it uses less digits than its factorization.

81913435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25973.

The product of its digits is 12960, while the sum is 34.

The square root of 81913435 is about 9050.6041234826. The cubic root of 81913435 is about 434.2952166840.

The spelling of 81913435 in words is "eighty-one million, nine hundred thirteen thousand, four hundred thirty-five".