82103977 has 4 divisors (see below), whose sum is σ = 82176340. Its totient is φ = 82031616.

The previous prime is 82103941. The next prime is 82103993. The reversal of 82103977 is 77930128.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25613721 + 56490256 = 5061^2 + 7516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82103977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82103927) 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, 34452 + ... + 36757.

It is an arithmetic number, because the mean of its divisors is an integer number (20544085).

Almost surely, 2^82103977 is an apocalyptic number.

It is an amenable number.

82103977 is a deficient number, since it is larger than the sum of its proper divisors (72363).

82103977 is a wasteful number, since it uses less digits than its factorization.

82103977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72362.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 82103977 is about 9061.1244887155. The cubic root of 82103977 is about 434.6316995339.

Subtracting from 82103977 its reverse (77930128), we obtain a square (4173849 = 2043²).

The spelling of 82103977 in words is "eighty-two million, one hundred three thousand, nine hundred seventy-seven".