811542 has 8 divisors (see below), whose sum is σ = 1623096. Its totient is φ = 270512.

The previous prime is 811523. The next prime is 811553. The reversal of 811542 is 245118.

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

811542 is an admirable number.

It is a congruent number.

It is an unprimeable number.

811542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67623 + ... + 67634.

It is an arithmetic number, because the mean of its divisors is an integer number (202887).

2⁸¹¹⁵⁴² is an apocalyptic number.

811542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811542 is a wasteful number, since it uses less digits than its factorization.

811542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135262.

The product of its digits is 320, while the sum is 21.

The square root of 811542 is about 900.8562593444. The cubic root of 811542 is about 93.2760901823.

The spelling of 811542 in words is "eight hundred eleven thousand, five hundred forty-two".