261390713 has 4 divisors (see below), whose sum is σ = 263055780. Its totient is φ = 259725648.

The previous prime is 261390707. The next prime is 261390721. The reversal of 261390713 is 317093162.

It is a happy number.

261390713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 317093162 = 2 ⋅158546581.

It can be written as a sum of positive squares in 2 ways, for example, as 39589264 + 221801449 = 6292^2 + 14893^2 .

It is a cyclic number.

It is not a de Polignac number, because 261390713 - 2¹⁴ = 261374329 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 261390713.

It is not an unprimeable number, because it can be changed into a prime (261390763) 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, 832298 + ... + 832611.

It is an arithmetic number, because the mean of its divisors is an integer number (65763945).

Almost surely, 2^261390713 is an apocalyptic number.

It is an amenable number.

261390713 is a deficient number, since it is larger than the sum of its proper divisors (1665067).

261390713 is a wasteful number, since it uses less digits than its factorization.

261390713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665066.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 261390713 is about 16167.5821630818. The cubic root of 261390713 is about 639.3863853410.

The spelling of 261390713 in words is "two hundred sixty-one million, three hundred ninety thousand, seven hundred thirteen".