81410842 has 4 divisors (see below), whose sum is σ = 122116266. Its totient is φ = 40705420.

The previous prime is 81410837. The next prime is 81410851. The reversal of 81410842 is 24801418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 62583921 + 18826921 = 7911^2 + 4339^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81410842.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20352709 + ... + 20352712.

Almost surely, 2^81410842 is an apocalyptic number.

81410842 is a deficient number, since it is larger than the sum of its proper divisors (40705424).

81410842 is a wasteful number, since it uses less digits than its factorization.

81410842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40705423.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 81410842 is about 9022.7956864821. The cubic root of 81410842 is about 433.4051645551.

The spelling of 81410842 in words is "eighty-one million, four hundred ten thousand, eight hundred forty-two".