1261360520 has 64 divisors (see below), whose sum is σ = 3246566400. Its totient is φ = 432057600.

The previous prime is 1261360493. The next prime is 1261360523. The reversal of 1261360520 is 250631621.

It is a super-2 number, since 2×1261360520² = 3182060722829340800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1261360520.

It is not an unprimeable number, because it can be changed into a prime (1261360523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 545126 + ... + 547434.

It is an arithmetic number, because the mean of its divisors is an integer number (50727600).

Almost surely, 2^1261360520 is an apocalyptic number.

1261360520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261360520 is an abundant number, since it is smaller than the sum of its proper divisors (1985205880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261360520 is a wasteful number, since it uses less digits than its factorization.

1261360520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278 (or 4274 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1261360520 is about 35515.6376825758. The cubic root of 1261360520 is about 1080.4709080394.

The spelling of 1261360520 in words is "one billion, two hundred sixty-one million, three hundred sixty thousand, five hundred twenty".