261441619 has 2 divisors, whose sum is σ = 261441620. Its totient is φ = 261441618.

The previous prime is 261441613. The next prime is 261441637. The reversal of 261441619 is 916144162.

It is a happy number.

261441619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261441619 - 2⁷ = 261441491 is a prime.

It is a super-2 number, since 2×261441619² = 136703440290682322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261441613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130720809 + 130720810.

It is an arithmetic number, because the mean of its divisors is an integer number (130720810).

Almost surely, 2^261441619 is an apocalyptic number.

261441619 is a deficient number, since it is larger than the sum of its proper divisors (1).

261441619 is an equidigital number, since it uses as much as digits as its factorization.

261441619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 34.

The square root of 261441619 is about 16169.1564096585. The cubic root of 261441619 is about 639.4278896090.

The spelling of 261441619 in words is "two hundred sixty-one million, four hundred forty-one thousand, six hundred nineteen".