81914605 has 8 divisors (see below), whose sum is σ = 103471200. Its totient is φ = 62082576.

The previous prime is 81914587. The next prime is 81914639. The reversal of 81914605 is 50641918.

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

It is not a de Polignac number, because 81914605 - 2¹¹ = 81912557 is a prime.

It is a congruent number.

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, 431035 + ... + 431224.

It is an arithmetic number, because the mean of its divisors is an integer number (12933900).

Almost surely, 2^81914605 is an apocalyptic number.

It is an amenable number.

81914605 is a deficient number, since it is larger than the sum of its proper divisors (21556595).

81914605 is a wasteful number, since it uses less digits than its factorization.

81914605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862283.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 81914605 is about 9050.6687598210. The cubic root of 81914605 is about 434.2972844074.

The spelling of 81914605 in words is "eighty-one million, nine hundred fourteen thousand, six hundred five".