261365456 has 20 divisors (see below), whose sum is σ = 552431904. Its totient is φ = 118802400.

The previous prime is 261365441. The next prime is 261365471. The reversal of 261365456 is 654563162.

It is a happy number.

261365456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261365441) and next prime (261365471).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 742340 + ... + 742691.

Almost surely, 2^261365456 is an apocalyptic number.

It is an amenable number.

261365456 is an abundant number, since it is smaller than the sum of its proper divisors (291066448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261365456 is a wasteful number, since it uses less digits than its factorization.

261365456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485050 (or 1485044 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 261365456 is about 16166.8010441151. The cubic root of 261365456 is about 639.3657910080.

The spelling of 261365456 in words is "two hundred sixty-one million, three hundred sixty-five thousand, four hundred fifty-six".