261338115 has 16 divisors (see below), whose sum is σ = 418818816. Its totient is φ = 139154400.

The previous prime is 261338113. The next prime is 261338171. The reversal of 261338115 is 511833162.

261338115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261338115 - 2¹ = 261338113 is a prime.

It is a super-2 number, since 2×261338115² = 136595220703506450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261338113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4341 + ... + 23270.

It is an arithmetic number, because the mean of its divisors is an integer number (26176176).

Almost surely, 2^261338115 is an apocalyptic number.

261338115 is a deficient number, since it is larger than the sum of its proper divisors (157480701).

261338115 is a wasteful number, since it uses less digits than its factorization.

261338115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28250.

The product of its digits is 4320, while the sum is 30.

The square root of 261338115 is about 16165.9554310904. The cubic root of 261338115 is about 639.3434959045.

The spelling of 261338115 in words is "two hundred sixty-one million, three hundred thirty-eight thousand, one hundred fifteen".