261051263 has 8 divisors (see below), whose sum is σ = 284912976. Its totient is φ = 237211200.

The previous prime is 261051257. The next prime is 261051289. The reversal of 261051263 is 362150162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261051263 - 2⁴ = 261051247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261051233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29795 + ... + 37547.

It is an arithmetic number, because the mean of its divisors is an integer number (35614122).

Almost surely, 2^261051263 is an apocalyptic number.

261051263 is a deficient number, since it is larger than the sum of its proper divisors (23861713).

261051263 is a wasteful number, since it uses less digits than its factorization.

261051263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10825.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 261051263 is about 16157.0808935278. The cubic root of 261051263 is about 639.1094898521.

The spelling of 261051263 in words is "two hundred sixty-one million, fifty-one thousand, two hundred sixty-three".