1261558060 has 96 divisors (see below), whose sum is σ = 3101253120. Its totient is φ = 422143488.

The previous prime is 1261558007. The next prime is 1261558079. The reversal of 1261558060 is 608551621.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1345912 + ... + 1346848.

It is an arithmetic number, because the mean of its divisors is an integer number (32304720).

Almost surely, 2^1261558060 is an apocalyptic number.

1261558060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261558060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1550626560).

1261558060 is an abundant number, since it is smaller than the sum of its proper divisors (1839695060).

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

1261558060 is a wasteful number, since it uses less digits than its factorization.

1261558060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 1261558060 is about 35518.4186021844. The cubic root of 1261558060 is about 1080.5273088010.

The spelling of 1261558060 in words is "one billion, two hundred sixty-one million, five hundred fifty-eight thousand, sixty".