261512141 has 4 divisors (see below), whose sum is σ = 285285984. Its totient is φ = 237738300.

The previous prime is 261512137. The next prime is 261512161. The reversal of 261512141 is 141215162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261512141 - 2² = 261512137 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261512161) 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, 11886905 + ... + 11886926.

It is an arithmetic number, because the mean of its divisors is an integer number (71321496).

Almost surely, 2^261512141 is an apocalyptic number.

It is an amenable number.

261512141 is a deficient number, since it is larger than the sum of its proper divisors (23773843).

261512141 is a wasteful number, since it uses less digits than its factorization.

261512141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23773842.

The product of its digits is 480, while the sum is 23.

The square root of 261512141 is about 16171.3370195541. The cubic root of 261512141 is about 639.4853781346.

It can be divided in two parts, 2615121 and 41, that added together give a palindrome (2615162).

The spelling of 261512141 in words is "two hundred sixty-one million, five hundred twelve thousand, one hundred forty-one".