81353801 has 4 divisors (see below), whose sum is σ = 85635600. Its totient is φ = 77072004.

The previous prime is 81353791. The next prime is 81353819. The reversal of 81353801 is 10835318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81353801 - 2¹⁸ = 81091657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81353821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2140871 + ... + 2140908.

It is an arithmetic number, because the mean of its divisors is an integer number (21408900).

Almost surely, 2^81353801 is an apocalyptic number.

It is an amenable number.

81353801 is a deficient number, since it is larger than the sum of its proper divisors (4281799).

81353801 is a wasteful number, since it uses less digits than its factorization.

81353801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4281798.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 81353801 is about 9019.6341943562. The cubic root of 81353801 is about 433.3039182532.

The spelling of 81353801 in words is "eighty-one million, three hundred fifty-three thousand, eight hundred one".