12779531 has 2 divisors, whose sum is σ = 12779532. Its totient is φ = 12779530.

The previous prime is 12779483. The next prime is 12779539. The reversal of 12779531 is 13597721.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13597721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12779531 - 2¹⁴ = 12763147 is a prime.

It is a super-2 number, since 2×12779531² = 326632825159922, which contains 22 as substring.

It is equal to p₈₃₅₈₅₆ and since 12779531 and 835856 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 12779491 and 12779500.

It is not a weakly prime, because it can be changed into another prime (12779539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6389765 + 6389766.

It is an arithmetic number, because the mean of its divisors is an integer number (6389766).

Almost surely, 2^12779531 is an apocalyptic number.

12779531 is a deficient number, since it is larger than the sum of its proper divisors (1).

12779531 is an equidigital number, since it uses as much as digits as its factorization.

12779531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230, while the sum is 35.

The square root of 12779531 is about 3574.8469897326. The cubic root of 12779531 is about 233.7966614503.

The spelling of 12779531 in words is "twelve million, seven hundred seventy-nine thousand, five hundred thirty-one".