261243267 has 32 divisors (see below), whose sum is σ = 381858624. Its totient is φ = 158208000.

The previous prime is 261243253. The next prime is 261243271. The reversal of 261243267 is 762342162.

It is not a de Polignac number, because 261243267 - 2⁸ = 261243011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261243287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210573 + ... + 211809.

It is an arithmetic number, because the mean of its divisors is an integer number (11933082).

Almost surely, 2^261243267 is an apocalyptic number.

261243267 is a deficient number, since it is larger than the sum of its proper divisors (120615357).

261243267 is a wasteful number, since it uses less digits than its factorization.

261243267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399.

The product of its digits is 24192, while the sum is 33.

The square root of 261243267 is about 16163.0215925117. The cubic root of 261243267 is about 639.2661404456.

The spelling of 261243267 in words is "two hundred sixty-one million, two hundred forty-three thousand, two hundred sixty-seven".