81434911 has 8 divisors (see below), whose sum is σ = 82542240. Its totient is φ = 80332032.

The previous prime is 81434887. The next prime is 81434921. The reversal of 81434911 is 11943418.

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 81434911 - 2⁷ = 81434783 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 (81434921) 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, 52006 + ... + 53548.

It is an arithmetic number, because the mean of its divisors is an integer number (10317780).

Almost surely, 2^81434911 is an apocalyptic number.

81434911 is a deficient number, since it is larger than the sum of its proper divisors (1107329).

81434911 is a wasteful number, since it uses less digits than its factorization.

81434911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225.

The product of its digits is 3456, while the sum is 31.

The square root of 81434911 is about 9024.1293762889. The cubic root of 81434911 is about 433.4478722207.

The spelling of 81434911 in words is "eighty-one million, four hundred thirty-four thousand, nine hundred eleven".