261940713 has 4 divisors (see below), whose sum is σ = 349254288. Its totient is φ = 174627140.

The previous prime is 261940699. The next prime is 261940733. The reversal of 261940713 is 317049162.

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 261940713 - 2⁹ = 261940201 is a prime.

It is a super-2 number, since 2×261940713² = 137225874253896738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261940733) 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, 43656783 + ... + 43656788.

It is an arithmetic number, because the mean of its divisors is an integer number (87313572).

Almost surely, 2^261940713 is an apocalyptic number.

It is an amenable number.

261940713 is a deficient number, since it is larger than the sum of its proper divisors (87313575).

261940713 is an equidigital number, since it uses as much as digits as its factorization.

261940713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87313574.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 261940713 is about 16184.5825710767. The cubic root of 261940713 is about 639.8345218336.

Adding to 261940713 its reverse (317049162), we get a palindrome (578989875).

The spelling of 261940713 in words is "two hundred sixty-one million, nine hundred forty thousand, seven hundred thirteen".