1201521355 has 4 divisors (see below), whose sum is σ = 1441825632. Its totient is φ = 961217080.

The previous prime is 1201521353. The next prime is 1201521361. The reversal of 1201521355 is 5531251021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1201521355 - 2¹ = 1201521353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201521353) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 120152131 + ... + 120152140.

It is an arithmetic number, because the mean of its divisors is an integer number (360456408).

Almost surely, 2^1201521355 is an apocalyptic number.

1201521355 is a deficient number, since it is larger than the sum of its proper divisors (240304277).

1201521355 is an equidigital number, since it uses as much as digits as its factorization.

1201521355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240304276.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1201521355 is about 34662.9680639151. The cubic root of 1201521355 is about 1063.1074575718.

Adding to 1201521355 its reverse (5531251021), we get a palindrome (6732772376).

The spelling of 1201521355 in words is "one billion, two hundred one million, five hundred twenty-one thousand, three hundred fifty-five".