1261119564 has 24 divisors (see below), whose sum is σ = 3269569520. Its totient is φ = 420373152.

The previous prime is 1261119539. The next prime is 1261119569. The reversal of 1261119564 is 4659111621.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1261119569) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5838409 + ... + 5838624.

Almost surely, 2^1261119564 is an apocalyptic number.

It is an amenable number.

1261119564 is an abundant number, since it is smaller than the sum of its proper divisors (2008449956).

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

1261119564 is a wasteful number, since it uses less digits than its factorization.

1261119564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11677046 (or 11677038 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1261119564 is about 35512.2452683578. The cubic root of 1261119564 is about 1080.4021033576.

The spelling of 1261119564 in words is "one billion, two hundred sixty-one million, one hundred nineteen thousand, five hundred sixty-four".