261012587 has 4 divisors (see below), whose sum is σ = 284741016. Its totient is φ = 237284160.

The previous prime is 261012571. The next prime is 261012593. The reversal of 261012587 is 785210162.

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 261012587 - 2⁴ = 261012571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261012517) 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, 11864198 + ... + 11864219.

It is an arithmetic number, because the mean of its divisors is an integer number (71185254).

Almost surely, 2^261012587 is an apocalyptic number.

261012587 is a deficient number, since it is larger than the sum of its proper divisors (23728429).

261012587 is a wasteful number, since it uses less digits than its factorization.

261012587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23728428.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 261012587 is about 16155.8839745772. The cubic root of 261012587 is about 639.0779259118.

The spelling of 261012587 in words is "two hundred sixty-one million, twelve thousand, five hundred eighty-seven".