261353403 has 6 divisors (see below), whose sum is σ = 377510484. Its totient is φ = 174235596.

The previous prime is 261353387. The next prime is 261353413. The reversal of 261353403 is 304353162.

It is a happy number.

261353403 is a `hidden beast` number, since 2 + 613 + 5 + 3 + 40 + 3 = 666.

It is not a de Polignac number, because 261353403 - 2⁴ = 261353387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261353413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14519625 + ... + 14519642.

It is an arithmetic number, because the mean of its divisors is an integer number (62918414).

Almost surely, 2^261353403 is an apocalyptic number.

261353403 is a deficient number, since it is larger than the sum of its proper divisors (116157081).

261353403 is a wasteful number, since it uses less digits than its factorization.

261353403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29039273 (or 29039270 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 261353403 is about 16166.4282697199. The cubic root of 261353403 is about 639.3559626315.

The spelling of 261353403 in words is "two hundred sixty-one million, three hundred fifty-three thousand, four hundred three".