261827963 has 4 divisors (see below), whose sum is σ = 261921240. Its totient is φ = 261734688.

The previous prime is 261827959. The next prime is 261827971. The reversal of 261827963 is 369728162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261827963 - 2² = 261827959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261827983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42293 + ... + 48086.

It is an arithmetic number, because the mean of its divisors is an integer number (65480310).

Almost surely, 2^261827963 is an apocalyptic number.

261827963 is a deficient number, since it is larger than the sum of its proper divisors (93277).

261827963 is an equidigital number, since it uses as much as digits as its factorization.

261827963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93276.

The product of its digits is 217728, while the sum is 44.

The square root of 261827963 is about 16181.0989429025. The cubic root of 261827963 is about 639.7427050062.

The spelling of 261827963 in words is "two hundred sixty-one million, eight hundred twenty-seven thousand, nine hundred sixty-three".