261453056 has 18 divisors (see below), whose sum is σ = 521885322. Its totient is φ = 130726400.

The previous prime is 261452993. The next prime is 261453113. The reversal of 261453056 is 650354162.

It can be written as a sum of positive squares in only one way, i.e., 248377600 + 13075456 = 15760^2 + 3616^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510395 + ... + 510906.

It is an arithmetic number, because the mean of its divisors is an integer number (28993629).

Almost surely, 2^261453056 is an apocalyptic number.

It is an amenable number.

261453056 is a deficient number, since it is larger than the sum of its proper divisors (260432266).

261453056 is an equidigital number, since it uses as much as digits as its factorization.

261453056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021317 (or 1021303 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 261453056 is about 16169.5100729738. The cubic root of 261453056 is about 639.4372135900.

The spelling of 261453056 in words is "two hundred sixty-one million, four hundred fifty-three thousand, fifty-six".