1311021441 has 6 divisors (see below), whose sum is σ = 1893697650. Its totient is φ = 874014288.

The previous prime is 1311021427. The next prime is 1311021449. The reversal of 1311021441 is 1441201131.

It can be written as a sum of positive squares in only one way, i.e., 894249216 + 416772225 = 29904^2 + 20415^2 .

It is not a de Polignac number, because 1311021441 - 2⁶ = 1311021377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311021449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72834516 + ... + 72834533.

It is an arithmetic number, because the mean of its divisors is an integer number (315616275).

Almost surely, 2^1311021441 is an apocalyptic number.

It is an amenable number.

1311021441 is a deficient number, since it is larger than the sum of its proper divisors (582676209).

1311021441 is a wasteful number, since it uses less digits than its factorization.

1311021441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145669055 (or 145669052 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1311021441 is about 36208.0300624047. The cubic root of 1311021441 is about 1094.4684954156.

Adding to 1311021441 its reverse (1441201131), we get a palindrome (2752222572).

The spelling of 1311021441 in words is "one billion, three hundred eleven million, twenty-one thousand, four hundred forty-one".