82409951 has 4 divisors (see below), whose sum is σ = 88749192. Its totient is φ = 76070712.

The previous prime is 82409923. The next prime is 82409969. The reversal of 82409951 is 15990428.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82409951 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 (82409981) 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, 3169601 + ... + 3169626.

It is an arithmetic number, because the mean of its divisors is an integer number (22187298).

Almost surely, 2^82409951 is an apocalyptic number.

82409951 is a deficient number, since it is larger than the sum of its proper divisors (6339241).

82409951 is a wasteful number, since it uses less digits than its factorization.

82409951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6339240.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 82409951 is about 9077.9926745950. The cubic root of 82409951 is about 435.1709391160.

The spelling of 82409951 in words is "eighty-two million, four hundred nine thousand, nine hundred fifty-one".