261135315 has 24 divisors (see below), whose sum is σ = 517297248. Its totient is φ = 119376000.

The previous prime is 261135313. The next prime is 261135331. The reversal of 261135315 is 513531162.

261135315 is a `hidden beast` number, since 2 + 611 + 35 + 3 + 15 = 666.

It is not a de Polignac number, because 261135315 - 2¹ = 261135313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261135313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 414186 + ... + 414815.

It is an arithmetic number, because the mean of its divisors is an integer number (21554052).

Almost surely, 2^261135315 is an apocalyptic number.

261135315 is a deficient number, since it is larger than the sum of its proper divisors (256161933).

261135315 is a wasteful number, since it uses less digits than its factorization.

261135315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829019 (or 829016 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 261135315 is about 16159.6817728568. The cubic root of 261135315 is about 639.1780749337.

Adding to 261135315 its reverse (513531162), we get a palindrome (774666477).

The spelling of 261135315 in words is "two hundred sixty-one million, one hundred thirty-five thousand, three hundred fifteen".