261212243 has 2 divisors, whose sum is σ = 261212244. Its totient is φ = 261212242.

The previous prime is 261212239. The next prime is 261212257. The reversal of 261212243 is 342212162.

It is a happy number.

261212243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261212243 - 2² = 261212239 is a prime.

It is a super-3 number, since 3×261212243³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (261212213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130606121 + 130606122.

It is an arithmetic number, because the mean of its divisors is an integer number (130606122).

Almost surely, 2^261212243 is an apocalyptic number.

261212243 is a deficient number, since it is larger than the sum of its proper divisors (1).

261212243 is an equidigital number, since it uses as much as digits as its factorization.

261212243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 261212243 is about 16162.0618424754. The cubic root of 261212243 is about 639.2408340481.

The spelling of 261212243 in words is "two hundred sixty-one million, two hundred twelve thousand, two hundred forty-three".