261420443 has 2 divisors, whose sum is σ = 261420444. Its totient is φ = 261420442.

The previous prime is 261420437. The next prime is 261420451. The reversal of 261420443 is 344024162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261420443 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (261420463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130710221 + 130710222.

It is an arithmetic number, because the mean of its divisors is an integer number (130710222).

Almost surely, 2^261420443 is an apocalyptic number.

261420443 is a deficient number, since it is larger than the sum of its proper divisors (1).

261420443 is an equidigital number, since it uses as much as digits as its factorization.

261420443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 261420443 is about 16168.5015694096. The cubic root of 261420443 is about 639.4106252185.

The spelling of 261420443 in words is "two hundred sixty-one million, four hundred twenty thousand, four hundred forty-three".