553251221 has 2 divisors, whose sum is σ = 553251222. Its totient is φ = 553251220.

The previous prime is 553251199. The next prime is 553251229. The reversal of 553251221 is 122152355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360430225 + 192820996 = 18985^2 + 13886^2 .

It is a cyclic number.

It is not a de Polignac number, because 553251221 - 2⁶ = 553251157 is a prime.

It is equal to p_29007260 and since 553251221 and 29007260 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553251229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276625610 + 276625611.

It is an arithmetic number, because the mean of its divisors is an integer number (276625611).

Almost surely, 2^553251221 is an apocalyptic number.

It is an amenable number.

553251221 is a deficient number, since it is larger than the sum of its proper divisors (1).

553251221 is an equidigital number, since it uses as much as digits as its factorization.

553251221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000, while the sum is 26.

The square root of 553251221 is about 23521.2929278983. The cubic root of 553251221 is about 820.9325208136.

The spelling of 553251221 in words is "five hundred fifty-three million, two hundred fifty-one thousand, two hundred twenty-one".