1261226580 has 48 divisors (see below), whose sum is σ = 3533316864. Its totient is φ = 336147840.

The previous prime is 1261226579. The next prime is 1261226609. The reversal of 1261226580 is 856221621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138570 + ... + 147390.

It is an arithmetic number, because the mean of its divisors is an integer number (73610768).

Almost surely, 2^1261226580 is an apocalyptic number.

1261226580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261226580 is an abundant number, since it is smaller than the sum of its proper divisors (2272090284).

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

1261226580 is a wasteful number, since it uses less digits than its factorization.

1261226580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11216 (or 11214 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1261226580 is about 35513.7519842666. The cubic root of 1261226580 is about 1080.4326627231.

The spelling of 1261226580 in words is "one billion, two hundred sixty-one million, two hundred twenty-six thousand, five hundred eighty".