82961721 has 24 divisors (see below), whose sum is σ = 126622080. Its totient is φ = 52256736.

The previous prime is 82961719. The next prime is 82961741. The reversal of 82961721 is 12716928.

It is not a de Polignac number, because 82961721 - 2¹ = 82961719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82961741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8886 + ... + 15648.

It is an arithmetic number, because the mean of its divisors is an integer number (5275920).

Almost surely, 2^82961721 is an apocalyptic number.

It is an amenable number.

82961721 is a deficient number, since it is larger than the sum of its proper divisors (43660359).

82961721 is a wasteful number, since it uses less digits than its factorization.

82961721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6845 (or 6842 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 82961721 is about 9108.3325038121. The cubic root of 82961721 is about 436.1399983185.

The spelling of 82961721 in words is "eighty-two million, nine hundred sixty-one thousand, seven hundred twenty-one".