261134215 has 4 divisors (see below), whose sum is σ = 313361064. Its totient is φ = 208907368.

The previous prime is 261134189. The next prime is 261134219. The reversal of 261134215 is 512431162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261134215 - 2¹⁵ = 261101447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261134215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261134219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26113417 + ... + 26113426.

It is an arithmetic number, because the mean of its divisors is an integer number (78340266).

Almost surely, 2^261134215 is an apocalyptic number.

261134215 is a deficient number, since it is larger than the sum of its proper divisors (52226849).

261134215 is an equidigital number, since it uses as much as digits as its factorization.

261134215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52226848.

The product of its digits is 1440, while the sum is 25.

The square root of 261134215 is about 16159.6477374973. The cubic root of 261134215 is about 639.1771774464.

Adding to 261134215 its reverse (512431162), we get a palindrome (773565377).

The spelling of 261134215 in words is "two hundred sixty-one million, one hundred thirty-four thousand, two hundred fifteen".