261100851 has 16 divisors (see below), whose sum is σ = 383149440. Its totient is φ = 156840320.

The previous prime is 261100849. The next prime is 261100871. The reversal of 261100851 is 158001162.

It is a cyclic number.

It is not a de Polignac number, because 261100851 - 2¹ = 261100849 is a prime.

It is a super-3 number, since 3×261100851³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (261100871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31281 + ... + 38738.

It is an arithmetic number, because the mean of its divisors is an integer number (23946840).

Almost surely, 2^261100851 is an apocalyptic number.

261100851 is a deficient number, since it is larger than the sum of its proper divisors (122048589).

261100851 is a wasteful number, since it uses less digits than its factorization.

261100851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70146.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 261100851 is about 16158.6153800380. The cubic root of 261100851 is about 639.1499546437.

The spelling of 261100851 in words is "two hundred sixty-one million, one hundred thousand, eight hundred fifty-one".