261047115 has 24 divisors (see below), whose sum is σ = 517122528. Its totient is φ = 119335680.

The previous prime is 261047089. The next prime is 261047119. The reversal of 261047115 is 511740162.

It is a happy number.

261047115 is a `hidden beast` number, since 2 + 610 + 47 + 1 + 1 + 5 = 666.

It is not a de Polignac number, because 261047115 - 2¹¹ = 261045067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261047119) 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, 414046 + ... + 414675.

It is an arithmetic number, because the mean of its divisors is an integer number (21546772).

Almost surely, 2^261047115 is an apocalyptic number.

261047115 is a deficient number, since it is larger than the sum of its proper divisors (256075413).

261047115 is a wasteful number, since it uses less digits than its factorization.

261047115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828739 (or 828736 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 261047115 is about 16156.9525282462. The cubic root of 261047115 is about 639.1061047695.

Adding to 261047115 its reverse (511740162), we get a palindrome (772787277).

It can be divided in two parts, 261047 and 115, that added together give a palindrome (261162).

The spelling of 261047115 in words is "two hundred sixty-one million, forty-seven thousand, one hundred fifteen".