261199869 has 8 divisors (see below), whose sum is σ = 398018880. Its totient is φ = 149257056.

The previous prime is 261199867. The next prime is 261199871. The reversal of 261199869 is 968991162.

It is an interprime number because it is at equal distance from previous prime (261199867) and next prime (261199871).

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

It is not a de Polignac number, because 261199869 - 2¹ = 261199867 is a prime.

It is a super-2 number, since 2×261199869² = 136450743131234322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261199867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6219024 + ... + 6219065.

It is an arithmetic number, because the mean of its divisors is an integer number (49752360).

Almost surely, 2^261199869 is an apocalyptic number.

It is an amenable number.

261199869 is a deficient number, since it is larger than the sum of its proper divisors (136819011).

261199869 is a wasteful number, since it uses less digits than its factorization.

261199869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12438099.

The product of its digits is 419904, while the sum is 51.

The square root of 261199869 is about 16161.6790278733. The cubic root of 261199869 is about 639.2307399692.

The spelling of 261199869 in words is "two hundred sixty-one million, one hundred ninety-nine thousand, eight hundred sixty-nine".