1201505405 has 4 divisors (see below), whose sum is σ = 1441806492. Its totient is φ = 961204320.

The previous prime is 1201505387. The next prime is 1201505423. The reversal of 1201505405 is 5045051021.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1201505387) and next prime (1201505423).

It can be written as a sum of positive squares in 2 ways, for example, as 402764761 + 798740644 = 20069^2 + 28262^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1201505405 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 120150536 + ... + 120150545.

It is an arithmetic number, because the mean of its divisors is an integer number (360451623).

Almost surely, 2^1201505405 is an apocalyptic number.

It is an amenable number.

1201505405 is a deficient number, since it is larger than the sum of its proper divisors (240301087).

1201505405 is an equidigital number, since it uses as much as digits as its factorization.

1201505405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240301086.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1201505405 is about 34662.7379905281. The cubic root of 1201505405 is about 1063.1027533583.

Adding to 1201505405 its reverse (5045051021), we get a palindrome (6246556426).

The spelling of 1201505405 in words is "one billion, two hundred one million, five hundred five thousand, four hundred five".