261456863 has 4 divisors (see below), whose sum is σ = 262197888. Its totient is φ = 260715840.

The previous prime is 261456851. The next prime is 261456869. The reversal of 261456863 is 368654162.

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 261456863 - 2⁸ = 261456607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261456863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261456869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369983 + ... + 370688.

It is an arithmetic number, because the mean of its divisors is an integer number (65549472).

Almost surely, 2^261456863 is an apocalyptic number.

261456863 is a deficient number, since it is larger than the sum of its proper divisors (741025).

261456863 is an equidigital number, since it uses as much as digits as its factorization.

261456863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741024.

The product of its digits is 207360, while the sum is 41.

The square root of 261456863 is about 16169.6277941083. The cubic root of 261456863 is about 639.4403171754.

The spelling of 261456863 in words is "two hundred sixty-one million, four hundred fifty-six thousand, eight hundred sixty-three".