261605152 has 12 divisors (see below), whose sum is σ = 515035206. Its totient is φ = 130802560.

The previous prime is 261605119. The next prime is 261605159. The reversal of 261605152 is 251506162.

It can be written as a sum of positive squares in only one way, i.e., 160883856 + 100721296 = 12684^2 + 10036^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261605152.

It is not an unprimeable number, because it can be changed into a prime (261605159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4087549 + ... + 4087612.

Almost surely, 2^261605152 is an apocalyptic number.

It is an amenable number.

261605152 is a deficient number, since it is larger than the sum of its proper divisors (253430054).

261605152 is an equidigital number, since it uses as much as digits as its factorization.

261605152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8175171 (or 8175163 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 261605152 is about 16174.2125619765. The cubic root of 261605152 is about 639.5611835690.

The spelling of 261605152 in words is "two hundred sixty-one million, six hundred five thousand, one hundred fifty-two".