261365156 has 12 divisors (see below), whose sum is σ = 492572892. Its totient is φ = 120630048.

The previous prime is 261365149. The next prime is 261365161. The reversal of 261365156 is 651563162.

261365156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 36844900 + 224520256 = 6070^2 + 14984^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513075 + ... + 2513178.

It is an arithmetic number, because the mean of its divisors is an integer number (41047741).

Almost surely, 2^261365156 is an apocalyptic number.

261365156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

261365156 is a deficient number, since it is larger than the sum of its proper divisors (231207736).

261365156 is a wasteful number, since it uses less digits than its factorization.

261365156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026270 (or 5026268 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 261365156 is about 16166.7917658390. The cubic root of 261365156 is about 639.3655463827.

The spelling of 261365156 in words is "two hundred sixty-one million, three hundred sixty-five thousand, one hundred fifty-six".