82681421 has 8 divisors (see below), whose sum is σ = 89911800. Its totient is φ = 75714048.

The previous prime is 82681411. The next prime is 82681427. The reversal of 82681421 is 12418628.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61622500 + 21058921 = 7850^2 + 4589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82681421 - 2¹⁸ = 82419277 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 (82681427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65096 + ... + 66353.

It is an arithmetic number, because the mean of its divisors is an integer number (11238975).

Almost surely, 2^82681421 is an apocalyptic number.

It is an amenable number.

82681421 is a deficient number, since it is larger than the sum of its proper divisors (7230379).

82681421 is a wasteful number, since it uses less digits than its factorization.

82681421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131503.

The product of its digits is 6144, while the sum is 32.

The square root of 82681421 is about 9092.9324752799. The cubic root of 82681421 is about 435.6482535324.

The spelling of 82681421 in words is "eighty-two million, six hundred eighty-one thousand, four hundred twenty-one".