261140613 has 4 divisors (see below), whose sum is σ = 348187488. Its totient is φ = 174093740.

The previous prime is 261140567. The next prime is 261140629. The reversal of 261140613 is 316041162.

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 261140613 - 2¹⁶ = 261075077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261140513) 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, 43523433 + ... + 43523438.

It is an arithmetic number, because the mean of its divisors is an integer number (87046872).

Almost surely, 2^261140613 is an apocalyptic number.

It is an amenable number.

261140613 is a deficient number, since it is larger than the sum of its proper divisors (87046875).

261140613 is an equidigital number, since it uses as much as digits as its factorization.

261140613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87046874.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 261140613 is about 16159.8456985208. The cubic root of 261140613 is about 639.1823975235.

Adding to 261140613 its reverse (316041162), we get a palindrome (577181775).

The spelling of 261140613 in words is "two hundred sixty-one million, one hundred forty thousand, six hundred thirteen".