261122851 has 4 divisors (see below), whose sum is σ = 284861304. Its totient is φ = 237384400.

The previous prime is 261122843. The next prime is 261122857. The reversal of 261122851 is 158221162.

261122851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261122851 - 2³ = 261122843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261122857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11869210 + ... + 11869231.

It is an arithmetic number, because the mean of its divisors is an integer number (71215326).

Almost surely, 2^261122851 is an apocalyptic number.

261122851 is a deficient number, since it is larger than the sum of its proper divisors (23738453).

261122851 is a wasteful number, since it uses less digits than its factorization.

261122851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23738452.

The product of its digits is 1920, while the sum is 28.

The square root of 261122851 is about 16159.2961170962. The cubic root of 261122851 is about 639.1679054394.

The spelling of 261122851 in words is "two hundred sixty-one million, one hundred twenty-two thousand, eight hundred fifty-one".