261505150 has 24 divisors (see below), whose sum is σ = 502092864. Its totient is φ = 101227200.

The previous prime is 261505129. The next prime is 261505163. The reversal of 261505150 is 51505162.

261505150 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82807 + ... + 85906.

It is an arithmetic number, because the mean of its divisors is an integer number (20920536).

Almost surely, 2^261505150 is an apocalyptic number.

261505150 is a deficient number, since it is larger than the sum of its proper divisors (240587714).

261505150 is a wasteful number, since it uses less digits than its factorization.

261505150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168756 (or 168751 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 261505150 is about 16171.1208640589. The cubic root of 261505150 is about 639.4796796329.

The spelling of 261505150 in words is "two hundred sixty-one million, five hundred five thousand, one hundred fifty".