82277981 has 4 divisors (see below), whose sum is σ = 82341312. Its totient is φ = 82214652.

The previous prime is 82277941. The next prime is 82277989. The reversal of 82277981 is 18977228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82277981 - 2⁶ = 82277917 is a prime.

It is a super-2 number, since 2×82277981² = 13539332314872722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82277989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29675 + ... + 32328.

It is an arithmetic number, because the mean of its divisors is an integer number (20585328).

Almost surely, 2^82277981 is an apocalyptic number.

It is an amenable number.

82277981 is a deficient number, since it is larger than the sum of its proper divisors (63331).

82277981 is a wasteful number, since it uses less digits than its factorization.

82277981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63330.

The product of its digits is 112896, while the sum is 44.

The square root of 82277981 is about 9070.7210848973. The cubic root of 82277981 is about 434.9385230424.

The spelling of 82277981 in words is "eighty-two million, two hundred seventy-seven thousand, nine hundred eighty-one".