261061587 has 6 divisors (see below), whose sum is σ = 377088972. Its totient is φ = 174041052.

The previous prime is 261061573. The next prime is 261061589. The reversal of 261061587 is 785160162.

261061587 is a `hidden beast` number, since 2 + 6 + 10 + 61 + 587 = 666.

It is not a de Polignac number, because 261061587 - 2¹⁶ = 260996051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261061589) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14503413 + ... + 14503430.

It is an arithmetic number, because the mean of its divisors is an integer number (62848162).

Almost surely, 2^261061587 is an apocalyptic number.

261061587 is a deficient number, since it is larger than the sum of its proper divisors (116027385).

261061587 is a wasteful number, since it uses less digits than its factorization.

261061587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29006849 (or 29006846 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 261061587 is about 16157.4003787738. The cubic root of 261061587 is about 639.1179148632.

The spelling of 261061587 in words is "two hundred sixty-one million, sixty-one thousand, five hundred eighty-seven".