81490911 has 8 divisors (see below), whose sum is σ = 115046064. Its totient is φ = 51131520.

The previous prime is 81490901. The next prime is 81490919. The reversal of 81490911 is 11909418.

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

It is not a de Polignac number, because 81490911 - 2⁹ = 81490399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81490919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 798880 + ... + 798981.

It is an arithmetic number, because the mean of its divisors is an integer number (14380758).

Almost surely, 2^81490911 is an apocalyptic number.

81490911 is a deficient number, since it is larger than the sum of its proper divisors (33555153).

81490911 is a wasteful number, since it uses less digits than its factorization.

81490911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597881.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 81490911 is about 9027.2316354462. The cubic root of 81490911 is about 433.5472052084.

The spelling of 81490911 in words is "eighty-one million, four hundred ninety thousand, nine hundred eleven".