82501861 has 4 divisors (see below), whose sum is σ = 88848172. Its totient is φ = 76155552.

The previous prime is 82501847. The next prime is 82501871. The reversal of 82501861 is 16810528.

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 46321636 + 36180225 = 6806^2 + 6015^2 .

It is a cyclic number.

It is not a de Polignac number, because 82501861 - 2⁷ = 82501733 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 (82501801) 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, 3173136 + ... + 3173161.

It is an arithmetic number, because the mean of its divisors is an integer number (22212043).

Almost surely, 2^82501861 is an apocalyptic number.

It is an amenable number.

82501861 is a deficient number, since it is larger than the sum of its proper divisors (6346311).

82501861 is a wasteful number, since it uses less digits than its factorization.

82501861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6346310.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 82501861 is about 9083.0535063931. The cubic root of 82501861 is about 435.3326578593.

The spelling of 82501861 in words is "eighty-two million, five hundred one thousand, eight hundred sixty-one".