521223779 has 2 divisors, whose sum is σ = 521223780. Its totient is φ = 521223778.

The previous prime is 521223767. The next prime is 521223793. The reversal of 521223779 is 977322125.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521223779 - 2¹⁶ = 521158243 is a prime.

It is not a weakly prime, because it can be changed into another prime (521723779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260611889 + 260611890.

It is an arithmetic number, because the mean of its divisors is an integer number (260611890).

Almost surely, 2^521223779 is an apocalyptic number.

521223779 is a deficient number, since it is larger than the sum of its proper divisors (1).

521223779 is an equidigital number, since it uses as much as digits as its factorization.

521223779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 521223779 is about 22830.3258627642. The cubic root of 521223779 is about 804.7754882306.

The spelling of 521223779 in words is "five hundred twenty-one million, two hundred twenty-three thousand, seven hundred seventy-nine".