78212579 has 2 divisors, whose sum is σ = 78212580. Its totient is φ = 78212578.

The previous prime is 78212551. The next prime is 78212599. The reversal of 78212579 is 97521287.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78212579 is a prime.

It is a super-2 number, since 2×78212579² = 12234415027662482, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (78212509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39106289 + 39106290.

It is an arithmetic number, because the mean of its divisors is an integer number (39106290).

Almost surely, 2^78212579 is an apocalyptic number.

78212579 is a deficient number, since it is larger than the sum of its proper divisors (1).

78212579 is an equidigital number, since it uses as much as digits as its factorization.

78212579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 78212579 is about 8843.7875935597. The cubic root of 78212579 is about 427.6536688645.

The spelling of 78212579 in words is "seventy-eight million, two hundred twelve thousand, five hundred seventy-nine".