82278013 has 2 divisors, whose sum is σ = 82278014. Its totient is φ = 82278012.

The previous prime is 82277989. The next prime is 82278067. The reversal of 82278013 is 31087228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70257924 + 12020089 = 8382^2 + 3467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82278013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82278073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41139006 + 41139007.

It is an arithmetic number, because the mean of its divisors is an integer number (41139007).

Almost surely, 2^82278013 is an apocalyptic number.

It is an amenable number.

82278013 is a deficient number, since it is larger than the sum of its proper divisors (1).

82278013 is an equidigital number, since it uses as much as digits as its factorization.

82278013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 82278013 is about 9070.7228488142. The cubic root of 82278013 is about 434.9385794286.

The spelling of 82278013 in words is "eighty-two million, two hundred seventy-eight thousand, thirteen".