261930359 has 2 divisors, whose sum is σ = 261930360. Its totient is φ = 261930358.

The previous prime is 261930353. The next prime is 261930413. The reversal of 261930359 is 953039162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261930359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261930353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130965179 + 130965180.

It is an arithmetic number, because the mean of its divisors is an integer number (130965180).

Almost surely, 2^261930359 is an apocalyptic number.

261930359 is a deficient number, since it is larger than the sum of its proper divisors (1).

261930359 is an equidigital number, since it uses as much as digits as its factorization.

261930359 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 38.

The square root of 261930359 is about 16184.2626955941. The cubic root of 261930359 is about 639.8260912568.

The spelling of 261930359 in words is "two hundred sixty-one million, nine hundred thirty thousand, three hundred fifty-nine".