1201331405 has 4 divisors (see below), whose sum is σ = 1441597692. Its totient is φ = 961065120.

The previous prime is 1201331399. The next prime is 1201331441. The reversal of 1201331405 is 5041331021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5041331021 = 571 ⋅8828951.

It can be written as a sum of positive squares in 2 ways, for example, as 786353764 + 414977641 = 28042^2 + 20371^2 .

It is not a de Polignac number, because 1201331405 - 2⁸ = 1201331149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120133136 + ... + 120133145.

It is an arithmetic number, because the mean of its divisors is an integer number (360399423).

Almost surely, 2^1201331405 is an apocalyptic number.

It is an amenable number.

1201331405 is a deficient number, since it is larger than the sum of its proper divisors (240266287).

1201331405 is an equidigital number, since it uses as much as digits as its factorization.

1201331405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240266286.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1201331405 is about 34660.2279998271. The cubic root of 1201331405 is about 1063.0514319609.

Adding to 1201331405 its reverse (5041331021), we get a palindrome (6242662426).

The spelling of 1201331405 in words is "one billion, two hundred one million, three hundred thirty-one thousand, four hundred five".