223152521 has 2 divisors, whose sum is σ = 223152522. Its totient is φ = 223152520.

The previous prime is 223152493. The next prime is 223152529. The reversal of 223152521 is 125251322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222606400 + 546121 = 14920^2 + 739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223152521 is a prime.

It is a super-3 number, since 3×223152521³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (223152529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111576260 + 111576261.

It is an arithmetic number, because the mean of its divisors is an integer number (111576261).

Almost surely, 2^223152521 is an apocalyptic number.

It is an amenable number.

223152521 is a deficient number, since it is larger than the sum of its proper divisors (1).

223152521 is an equidigital number, since it uses as much as digits as its factorization.

223152521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 23.

The square root of 223152521 is about 14938.2904309697. The cubic root of 223152521 is about 606.5509200680.

The spelling of 223152521 in words is "two hundred twenty-three million, one hundred fifty-two thousand, five hundred twenty-one".