261913427 has 2 divisors, whose sum is σ = 261913428. Its totient is φ = 261913426.

The previous prime is 261913403. The next prime is 261913433. The reversal of 261913427 is 724319162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261913427 - 2¹⁰ = 261912403 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261915427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130956713 + 130956714.

It is an arithmetic number, because the mean of its divisors is an integer number (130956714).

Almost surely, 2^261913427 is an apocalyptic number.

261913427 is a deficient number, since it is larger than the sum of its proper divisors (1).

261913427 is an equidigital number, since it uses as much as digits as its factorization.

261913427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 261913427 is about 16183.7395863873. The cubic root of 261913427 is about 639.8123041712.

The spelling of 261913427 in words is "two hundred sixty-one million, nine hundred thirteen thousand, four hundred twenty-seven".