1201044311531 has 4 divisors (see below), whose sum is σ = 1203980850600. Its totient is φ = 1198107772464.

The previous prime is 1201044311527. The next prime is 1201044311603. The reversal of 1201044311531 is 1351134401021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201044311531 - 2² = 1201044311527 is a prime.

It is a super-2 number, since 2×1201044311531² (a number of 25 digits) contains 22 as substring.

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 1201044311531.

It is not an unprimeable number, because it can be changed into a prime (1201044313531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1468268921 + ... + 1468269738.

It is an arithmetic number, because the mean of its divisors is an integer number (300995212650).

Almost surely, 2^{1201044311531} is an apocalyptic number.

1201044311531 is a deficient number, since it is larger than the sum of its proper divisors (2936539069).

1201044311531 is an equidigital number, since it uses as much as digits as its factorization.

1201044311531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936539068.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 1201044311531 its reverse (1351134401021), we get a palindrome (2552178712552).

The spelling of 1201044311531 in words is "one trillion, two hundred one billion, forty-four million, three hundred eleven thousand, five hundred thirty-one".