1261073544 has 32 divisors (see below), whose sum is σ = 3219765120. Its totient is φ = 411413696.

The previous prime is 1261073543. The next prime is 1261073579. The reversal of 1261073544 is 4453701621.

It is not an unprimeable number, because it can be changed into a prime (1261073543) 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, 557859 + ... + 560114.

It is an arithmetic number, because the mean of its divisors is an integer number (100617660).

Almost surely, 2^1261073544 is an apocalyptic number.

It is an amenable number.

1261073544 is an abundant number, since it is smaller than the sum of its proper divisors (1958691576).

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

1261073544 is a wasteful number, since it uses less digits than its factorization.

1261073544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118029 (or 1118025 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 1261073544 is about 35511.5973169330. The cubic root of 1261073544 is about 1080.3889614079.

The spelling of 1261073544 in words is "one billion, two hundred sixty-one million, seventy-three thousand, five hundred forty-four".