523451221 has 2 divisors, whose sum is σ = 523451222. Its totient is φ = 523451220.

The previous prime is 523451147. The next prime is 523451231. The reversal of 523451221 is 122154325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 468246321 + 55204900 = 21639^2 + 7430^2 .

It is a cyclic number.

It is not a de Polignac number, because 523451221 - 2⁹ = 523450709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523451231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261725610 + 261725611.

It is an arithmetic number, because the mean of its divisors is an integer number (261725611).

Almost surely, 2^523451221 is an apocalyptic number.

It is an amenable number.

523451221 is a deficient number, since it is larger than the sum of its proper divisors (1).

523451221 is an equidigital number, since it uses as much as digits as its factorization.

523451221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 25.

The square root of 523451221 is about 22879.0563835137. The cubic root of 523451221 is about 805.9202577160.

The spelling of 523451221 in words is "five hundred twenty-three million, four hundred fifty-one thousand, two hundred twenty-one".