261456995 has 4 divisors (see below), whose sum is σ = 313748400. Its totient is φ = 209165592.

The previous prime is 261456947. The next prime is 261456997. The reversal of 261456995 is 599654162.

261456995 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 261456995 - 2²⁰ = 260408419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261456997) 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, 26145695 + ... + 26145704.

It is an arithmetic number, because the mean of its divisors is an integer number (78437100).

Almost surely, 2^261456995 is an apocalyptic number.

261456995 is a deficient number, since it is larger than the sum of its proper divisors (52291405).

261456995 is an equidigital number, since it uses as much as digits as its factorization.

261456995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52291404.

The product of its digits is 583200, while the sum is 47.

The square root of 261456995 is about 16169.6318758344. The cubic root of 261456995 is about 639.4404247854.

The spelling of 261456995 in words is "two hundred sixty-one million, four hundred fifty-six thousand, nine hundred ninety-five".