261943267 has 16 divisors (see below), whose sum is σ = 273549312. Its totient is φ = 250652160.

The previous prime is 261943247. The next prime is 261943289. The reversal of 261943267 is 762349162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261943267 - 2²³ = 253554659 is a prime.

It is a super-2 number, since 2×261943267² = 137228550253266578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261943247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607542 + ... + 607972.

It is an arithmetic number, because the mean of its divisors is an integer number (17096832).

Almost surely, 2^261943267 is an apocalyptic number.

261943267 is a deficient number, since it is larger than the sum of its proper divisors (11606045).

261943267 is a wasteful number, since it uses less digits than its factorization.

261943267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738.

The product of its digits is 108864, while the sum is 40.

The square root of 261943267 is about 16184.6614731356. The cubic root of 261943267 is about 639.8366013526.

The spelling of 261943267 in words is "two hundred sixty-one million, nine hundred forty-three thousand, two hundred sixty-seven".