261390707 has 2 divisors, whose sum is σ = 261390708. Its totient is φ = 261390706.

The previous prime is 261390677. The next prime is 261390721. The reversal of 261390707 is 707093162.

261390707 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261390707 - 2¹⁸ = 261128563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261390007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130695353 + 130695354.

It is an arithmetic number, because the mean of its divisors is an integer number (130695354).

Almost surely, 2^261390707 is an apocalyptic number.

261390707 is a deficient number, since it is larger than the sum of its proper divisors (1).

261390707 is an equidigital number, since it uses as much as digits as its factorization.

261390707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 261390707 is about 16167.5819775253. The cubic root of 261390707 is about 639.3863804488.

The spelling of 261390707 in words is "two hundred sixty-one million, three hundred ninety thousand, seven hundred seven".