82545021 has 16 divisors (see below), whose sum is σ = 131696320. Its totient is φ = 50796720.

The previous prime is 82544981. The next prime is 82545037. The reversal of 82545021 is 12054528.

It is a happy number.

It is not a de Polignac number, because 82545021 - 2⁷ = 82544893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82545041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117235 + ... + 117936.

It is an arithmetic number, because the mean of its divisors is an integer number (8231020).

Almost surely, 2^82545021 is an apocalyptic number.

It is an amenable number.

82545021 is a deficient number, since it is larger than the sum of its proper divisors (49151299).

82545021 is a wasteful number, since it uses less digits than its factorization.

82545021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235193 (or 235187 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 82545021 is about 9085.4290487571. The cubic root of 82545021 is about 435.4085578928.

Adding to 82545021 its reverse (12054528), we get a palindrome (94599549).

The spelling of 82545021 in words is "eighty-two million, five hundred forty-five thousand, twenty-one".