81042058 has 4 divisors (see below), whose sum is σ = 121563090. Its totient is φ = 40521028.

The previous prime is 81042019. The next prime is 81042103. The reversal of 81042058 is 85024018.

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., 69772609 + 11269449 = 8353^2 + 3357^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20260513 + ... + 20260516.

Almost surely, 2^81042058 is an apocalyptic number.

81042058 is a deficient number, since it is larger than the sum of its proper divisors (40521032).

81042058 is a wasteful number, since it uses less digits than its factorization.

81042058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40521031.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 81042058 is about 9002.3362523292. The cubic root of 81042058 is about 432.7497447180.

The spelling of 81042058 in words is "eighty-one million, forty-two thousand, fifty-eight".