261135250 has 32 divisors (see below), whose sum is σ = 489805056. Its totient is φ = 104249200.

The previous prime is 261135229. The next prime is 261135263. The reversal of 261135250 is 52531162.

261135250 is digitally balanced in base 2, 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 an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236199 + ... + 237301.

It is an arithmetic number, because the mean of its divisors is an integer number (15306408).

Almost surely, 2^261135250 is an apocalyptic number.

261135250 is a deficient number, since it is larger than the sum of its proper divisors (228669806).

261135250 is a wasteful number, since it uses less digits than its factorization.

261135250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067 (or 2057 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 261135250 is about 16159.6797616784. The cubic root of 261135250 is about 639.1780219004.

The spelling of 261135250 in words is "two hundred sixty-one million, one hundred thirty-five thousand, two hundred fifty".