261930341 has 2 divisors, whose sum is σ = 261930342. Its totient is φ = 261930340.

The previous prime is 261930313. The next prime is 261930353. The reversal of 261930341 is 143039162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188485441 + 73444900 = 13729^2 + 8570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261930341 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261930301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130965170 + 130965171.

It is an arithmetic number, because the mean of its divisors is an integer number (130965171).

Almost surely, 2^261930341 is an apocalyptic number.

It is an amenable number.

261930341 is a deficient number, since it is larger than the sum of its proper divisors (1).

261930341 is an equidigital number, since it uses as much as digits as its factorization.

261930341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 261930341 is about 16184.2621394984. The cubic root of 261930341 is about 639.8260766004.

The spelling of 261930341 in words is "two hundred sixty-one million, nine hundred thirty thousand, three hundred forty-one".