261158586 has 32 divisors (see below), whose sum is σ = 563615808. Its totient is φ = 80196480.

The previous prime is 261158581. The next prime is 261158593. The reversal of 261158586 is 685851162.

It is not an unprimeable number, because it can be changed into a prime (261158581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39606 + ... + 45726.

It is an arithmetic number, because the mean of its divisors is an integer number (17612994).

Almost surely, 2^261158586 is an apocalyptic number.

261158586 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

261158586 is an abundant number, since it is smaller than the sum of its proper divisors (302457222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261158586 is a wasteful number, since it uses less digits than its factorization.

261158586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6686.

The product of its digits is 115200, while the sum is 42.

The square root of 261158586 is about 16160.4017895596. The cubic root of 261158586 is about 639.1970610944.

The spelling of 261158586 in words is "two hundred sixty-one million, one hundred fifty-eight thousand, five hundred eighty-six".