82121541 has 4 divisors (see below), whose sum is σ = 109495392. Its totient is φ = 54747692.

The previous prime is 82121531. The next prime is 82121587. The reversal of 82121541 is 14512128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82121541 - 2¹¹ = 82119493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82121531) 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, 13686921 + ... + 13686926.

It is an arithmetic number, because the mean of its divisors is an integer number (27373848).

Almost surely, 2^82121541 is an apocalyptic number.

It is an amenable number.

82121541 is a deficient number, since it is larger than the sum of its proper divisors (27373851).

82121541 is a wasteful number, since it uses less digits than its factorization.

82121541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27373850.

The product of its digits is 640, while the sum is 24.

The square root of 82121541 is about 9062.0936322684. The cubic root of 82121541 is about 434.6626900217.

Adding to 82121541 its reverse (14512128), we get a palindrome (96633669).

The spelling of 82121541 in words is "eighty-two million, one hundred twenty-one thousand, five hundred forty-one".