261317852 has 12 divisors (see below), whose sum is σ = 459046896. Its totient is φ = 130161600.

The previous prime is 261317831. The next prime is 261317893. The reversal of 261317852 is 258713162.

It is a happy number.

It is a congruent number.

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, 123149 + ... + 125252.

It is an arithmetic number, because the mean of its divisors is an integer number (38253908).

Almost surely, 2^261317852 is an apocalyptic number.

It is an amenable number.

261317852 is a deficient number, since it is larger than the sum of its proper divisors (197729044).

261317852 is a wasteful number, since it uses less digits than its factorization.

261317852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248668 (or 248666 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 261317852 is about 16165.3287006482. The cubic root of 261317852 is about 639.3269715231.

The spelling of 261317852 in words is "two hundred sixty-one million, three hundred seventeen thousand, eight hundred fifty-two".