1261613504 has 28 divisors (see below), whose sum is σ = 2504657424. Its totient is φ = 630518784.

The previous prime is 1261613491. The next prime is 1261613519. The reversal of 1261613504 is 4053161621.

It is a happy number.

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 in 3 ways as a sum of consecutive naturals, for example, 238472 + ... + 243704.

Almost surely, 2^1261613504 is an apocalyptic number.

It is an amenable number.

1261613504 is a deficient number, since it is larger than the sum of its proper divisors (1243043920).

1261613504 is an equidigital number, since it uses as much as digits as its factorization.

1261613504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9012 (or 9002 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1261613504 is about 35519.1990900696. The cubic root of 1261613504 is about 1080.5431378726.

The spelling of 1261613504 in words is "one billion, two hundred sixty-one million, six hundred thirteen thousand, five hundred four".