81482279 has 4 divisors (see below), whose sum is σ = 85770840. Its totient is φ = 77193720.

The previous prime is 81482273. The next prime is 81482281. The reversal of 81482279 is 97228418.

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

It is a cyclic number.

It is not a de Polignac number, because 81482279 - 2⁴ = 81482263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81482273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144252 + ... + 2144289.

It is an arithmetic number, because the mean of its divisors is an integer number (21442710).

Almost surely, 2^81482279 is an apocalyptic number.

81482279 is a deficient number, since it is larger than the sum of its proper divisors (4288561).

81482279 is a wasteful number, since it uses less digits than its factorization.

81482279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288560.

The product of its digits is 64512, while the sum is 41.

The square root of 81482279 is about 9026.7535138609. The cubic root of 81482279 is about 433.5318967052.

The spelling of 81482279 in words is "eighty-one million, four hundred eighty-two thousand, two hundred seventy-nine".