261423603 has 96 divisors (see below), whose sum is σ = 498700800. Its totient is φ = 128314368.

The previous prime is 261423583. The next prime is 261423607. The reversal of 261423603 is 306324162.

261423603 is a `hidden beast` number, since 26 + 14 + 23 + 603 = 666.

It is not a de Polignac number, because 261423603 - 2⁵ = 261423571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261423607) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 589900 + ... + 590342.

It is an arithmetic number, because the mean of its divisors is an integer number (5194800).

Almost surely, 2^261423603 is an apocalyptic number.

261423603 is a deficient number, since it is larger than the sum of its proper divisors (237277197).

261423603 is a wasteful number, since it uses less digits than its factorization.

261423603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 261423603 is about 16168.5992899818. The cubic root of 261423603 is about 639.4132015656.

Adding to 261423603 its reverse (306324162), we get a palindrome (567747765).

The spelling of 261423603 in words is "two hundred sixty-one million, four hundred twenty-three thousand, six hundred three".