81053089 has 8 divisors (see below), whose sum is σ = 87733800. Its totient is φ = 74436096.

The previous prime is 81053087. The next prime is 81053099. The reversal of 81053089 is 98035018.

It can be written as a sum of positive squares in 4 ways, for example, as 36096064 + 44957025 = 6008^2 + 6705^2 .

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 81053089 - 2¹ = 81053087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81053087) 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, 13264 + ... + 18385.

It is an arithmetic number, because the mean of its divisors is an integer number (10966725).

Almost surely, 2^81053089 is an apocalyptic number.

It is an amenable number.

81053089 is a deficient number, since it is larger than the sum of its proper divisors (6680711).

81053089 is a wasteful number, since it uses less digits than its factorization.

81053089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31859.

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

The square root of 81053089 is about 9002.9489057753. The cubic root of 81053089 is about 432.7693783337.

The spelling of 81053089 in words is "eighty-one million, fifty-three thousand, eighty-nine".