81358401 has 8 divisors (see below), whose sum is σ = 108752704. Its totient is φ = 54101520.

The previous prime is 81358397. The next prime is 81358411. The reversal of 81358401 is 10485318.

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

It is not a de Polignac number, because 81358401 - 2² = 81358397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81358411) 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 7 ways as a sum of consecutive naturals, for example, 32965 + ... + 35346.

It is an arithmetic number, because the mean of its divisors is an integer number (13594088).

Almost surely, 2^81358401 is an apocalyptic number.

It is an amenable number.

81358401 is a deficient number, since it is larger than the sum of its proper divisors (27394303).

81358401 is a wasteful number, since it uses less digits than its factorization.

81358401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68711.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 81358401 is about 9019.8891900067. The cubic root of 81358401 is about 433.3120848884.

The spelling of 81358401 in words is "eighty-one million, three hundred fifty-eight thousand, four hundred one".