261112087 has 4 divisors (see below), whose sum is σ = 261349920. Its totient is φ = 260874256.

The previous prime is 261112063. The next prime is 261112097. The reversal of 261112087 is 780211162.

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

It is a cyclic number.

It is not a de Polignac number, because 261112087 - 2¹¹ = 261110039 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 (261112057) 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, 117262 + ... + 119467.

It is an arithmetic number, because the mean of its divisors is an integer number (65337480).

Almost surely, 2^261112087 is an apocalyptic number.

261112087 is a deficient number, since it is larger than the sum of its proper divisors (237833).

261112087 is a wasteful number, since it uses less digits than its factorization.

261112087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237832.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 261112087 is about 16158.9630546022. The cubic root of 261112087 is about 639.1591227306.

The spelling of 261112087 in words is "two hundred sixty-one million, one hundred twelve thousand, eighty-seven".