81053291 has 8 divisors (see below), whose sum is σ = 88986864. Its totient is φ = 73213920.

The previous prime is 81053281. The next prime is 81053309. The reversal of 81053291 is 19235018.

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 81053291 - 2⁶ = 81053227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81053261) 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, 21740 + ... + 25193.

It is an arithmetic number, because the mean of its divisors is an integer number (11123358).

Almost surely, 2^81053291 is an apocalyptic number.

81053291 is a deficient number, since it is larger than the sum of its proper divisors (7933573).

81053291 is a wasteful number, since it uses less digits than its factorization.

81053291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47101.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 81053291 is about 9002.9601243147. The cubic root of 81053291 is about 432.7697378484.

The spelling of 81053291 in words is "eighty-one million, fifty-three thousand, two hundred ninety-one".