1201521144 has 32 divisors (see below), whose sum is σ = 3004657920. Its totient is φ = 400393056.

The previous prime is 1201521131. The next prime is 1201521151. The reversal of 1201521144 is 4411251021.

It is a self number, because there is not a number n which added to its sum of digits gives 1201521144.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146907 + ... + 154869.

It is an arithmetic number, because the mean of its divisors is an integer number (93895560).

Almost surely, 2^1201521144 is an apocalyptic number.

It is an amenable number.

1201521144 is an abundant number, since it is smaller than the sum of its proper divisors (1803136776).

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

1201521144 is a wasteful number, since it uses less digits than its factorization.

1201521144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14259 (or 14255 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1201521144 is about 34662.9650203210. The cubic root of 1201521144 is about 1063.1073953408.

Adding to 1201521144 its reverse (4411251021), we get a palindrome (5612772165).

The spelling of 1201521144 in words is "one billion, two hundred one million, five hundred twenty-one thousand, one hundred forty-four".