201123547 has 2 divisors, whose sum is σ = 201123548. Its totient is φ = 201123546.

The previous prime is 201123521. The next prime is 201123553. The reversal of 201123547 is 745321102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201123547 - 2¹⁵ = 201090779 is a prime.

It is a super-2 number, since 2×201123547² = 80901362315722418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201123557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100561773 + 100561774.

It is an arithmetic number, because the mean of its divisors is an integer number (100561774).

Almost surely, 2^201123547 is an apocalyptic number.

201123547 is a deficient number, since it is larger than the sum of its proper divisors (1).

201123547 is an equidigital number, since it uses as much as digits as its factorization.

201123547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 201123547 is about 14181.8033761578. The cubic root of 201123547 is about 585.8965938286.

Adding to 201123547 its reverse (745321102), we get a palindrome (946444649).

The spelling of 201123547 in words is "two hundred one million, one hundred twenty-three thousand, five hundred forty-seven".