261365154 has 32 divisors (see below), whose sum is σ = 549794304. Its totient is φ = 82717440.

The previous prime is 261365149. The next prime is 261365161. The reversal of 261365154 is 451563162.

261365154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3399 + ... + 23114.

It is an arithmetic number, because the mean of its divisors is an integer number (17181072).

Almost surely, 2^261365154 is an apocalyptic number.

261365154 is an abundant number, since it is smaller than the sum of its proper divisors (288429150).

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

261365154 is a wasteful number, since it uses less digits than its factorization.

261365154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26602.

The product of its digits is 21600, while the sum is 33.

The square root of 261365154 is about 16166.7917039838. The cubic root of 261365154 is about 639.3655447519.

The spelling of 261365154 in words is "two hundred sixty-one million, three hundred sixty-five thousand, one hundred fifty-four".