521612779 has 2 divisors, whose sum is σ = 521612780. Its totient is φ = 521612778.

The previous prime is 521612771. The next prime is 521612797. The reversal of 521612779 is 977216125.

Together with next prime (521612797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521612779 - 2³ = 521612771 is a prime.

It is a super-2 number, since 2×521612779² = 544159782432205682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521612771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260806389 + 260806390.

It is an arithmetic number, because the mean of its divisors is an integer number (260806390).

Almost surely, 2^521612779 is an apocalyptic number.

521612779 is a deficient number, since it is larger than the sum of its proper divisors (1).

521612779 is an equidigital number, since it uses as much as digits as its factorization.

521612779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 40.

The square root of 521612779 is about 22838.8436441077. The cubic root of 521612779 is about 804.9756452645.

The spelling of 521612779 in words is "five hundred twenty-one million, six hundred twelve thousand, seven hundred seventy-nine".