1201440155 has 8 divisors (see below), whose sum is σ = 1444083792. Its totient is φ = 959581728.

The previous prime is 1201440151. The next prime is 1201440211. The reversal of 1201440155 is 5510441021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1201440155 - 2² = 1201440151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201440155.

It is not an unprimeable number, because it can be changed into a prime (1201440151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192929 + ... + 199058.

It is an arithmetic number, because the mean of its divisors is an integer number (180510474).

Almost surely, 2^1201440155 is an apocalyptic number.

1201440155 is a deficient number, since it is larger than the sum of its proper divisors (242643637).

1201440155 is an equidigital number, since it uses as much as digits as its factorization.

1201440155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392605.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1201440155 is about 34661.7967653150. The cubic root of 1201440155 is about 1063.0835084150.

Adding to 1201440155 its reverse (5510441021), we get a palindrome (6711881176).

The spelling of 1201440155 in words is "one billion, two hundred one million, four hundred forty thousand, one hundred fifty-five".