82775509 has 2 divisors, whose sum is σ = 82775510. Its totient is φ = 82775508.

The previous prime is 82775501. The next prime is 82775513. The reversal of 82775509 is 90557728.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43362225 + 39413284 = 6585^2 + 6278^2 .

It is a cyclic number.

It is not a de Polignac number, because 82775509 - 2³ = 82775501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82775501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41387754 + 41387755.

It is an arithmetic number, because the mean of its divisors is an integer number (41387755).

Almost surely, 2^82775509 is an apocalyptic number.

It is an amenable number.

82775509 is a deficient number, since it is larger than the sum of its proper divisors (1).

82775509 is an equidigital number, since it uses as much as digits as its factorization.

82775509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 82775509 is about 9098.1046927368. The cubic root of 82775509 is about 435.8134407219.

The spelling of 82775509 in words is "eighty-two million, seven hundred seventy-five thousand, five hundred nine".