261502263 has 72 divisors (see below), whose sum is σ = 452664576. Its totient is φ = 149590800.

The previous prime is 261502261. The next prime is 261502321. The reversal of 261502263 is 362205162.

It is not a de Polignac number, because 261502263 - 2¹ = 261502261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261502261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 964818 + ... + 965088.

It is an arithmetic number, because the mean of its divisors is an integer number (6287008).

Almost surely, 2^261502263 is an apocalyptic number.

261502263 is a deficient number, since it is larger than the sum of its proper divisors (191162313).

261502263 is a wasteful number, since it uses less digits than its factorization.

261502263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 261502263 is about 16171.0315997465. The cubic root of 261502263 is about 639.4773263528.

The spelling of 261502263 in words is "two hundred sixty-one million, five hundred two thousand, two hundred sixty-three".