261213115 has 8 divisors (see below), whose sum is σ = 313543440. Its totient is φ = 208912032.

The previous prime is 261213103. The next prime is 261213133. The reversal of 261213115 is 511312162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261213115 - 2¹⁵ = 261180347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26952 + ... + 35338.

It is an arithmetic number, because the mean of its divisors is an integer number (39192930).

Almost surely, 2^261213115 is an apocalyptic number.

261213115 is a deficient number, since it is larger than the sum of its proper divisors (52330325).

261213115 is an equidigital number, since it uses as much as digits as its factorization.

261213115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14621.

The product of its digits is 360, while the sum is 22.

The square root of 261213115 is about 16162.0888192090. The cubic root of 261213115 is about 639.2415453692.

Adding to 261213115 its reverse (511312162), we get a palindrome (772525277).

The spelling of 261213115 in words is "two hundred sixty-one million, two hundred thirteen thousand, one hundred fifteen".