1201581318 has 128 divisors (see below), whose sum is σ = 3195002880. Its totient is φ = 292723200.

The previous prime is 1201581317. The next prime is 1201581323. The reversal of 1201581318 is 8131851021.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201581313) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 310093 + ... + 313943.

It is an arithmetic number, because the mean of its divisors is an integer number (24960960).

Almost surely, 2^1201581318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201581318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1597501440).

1201581318 is an abundant number, since it is smaller than the sum of its proper divisors (1993421562).

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

1201581318 is a wasteful number, since it uses less digits than its factorization.

1201581318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3922.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 1201581318 is about 34663.8329963667. The cubic root of 1201581318 is about 1063.1251423878.

The spelling of 1201581318 in words is "one billion, two hundred one million, five hundred eighty-one thousand, three hundred eighteen".