243225401 has 2 divisors, whose sum is σ = 243225402. Its totient is φ = 243225400.

The previous prime is 243225337. The next prime is 243225413. The reversal of 243225401 is 104522342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149426176 + 93799225 = 12224^2 + 9685^2 .

It is a cyclic number.

It is not a de Polignac number, because 243225401 - 2⁶ = 243225337 is a prime.

It is a super-2 number, since 2×243225401² = 118317191383221602, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243225421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121612700 + 121612701.

It is an arithmetic number, because the mean of its divisors is an integer number (121612701).

Almost surely, 2^243225401 is an apocalyptic number.

It is an amenable number.

243225401 is a deficient number, since it is larger than the sum of its proper divisors (1).

243225401 is an equidigital number, since it uses as much as digits as its factorization.

243225401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 243225401 is about 15595.6853328092. The cubic root of 243225401 is about 624.2180309003.

Adding to 243225401 its reverse (104522342), we get a palindrome (347747743).

The spelling of 243225401 in words is "two hundred forty-three million, two hundred twenty-five thousand, four hundred one".