1313221641 has 16 divisors (see below), whose sum is σ = 1782144000. Its totient is φ = 859964688.

The previous prime is 1313221631. The next prime is 1313221687. The reversal of 1313221641 is 1461223131.

It is a happy number.

It is not a de Polignac number, because 1313221641 - 2⁶ = 1313221577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1313221621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63060 + ... + 81258.

It is an arithmetic number, because the mean of its divisors is an integer number (111384000).

Almost surely, 2^1313221641 is an apocalyptic number.

It is an amenable number.

1313221641 is a deficient number, since it is larger than the sum of its proper divisors (468922359).

1313221641 is a wasteful number, since it uses less digits than its factorization.

1313221641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18628.

The product of its digits is 864, while the sum is 24.

The square root of 1313221641 is about 36238.4000888560. The cubic root of 1313221641 is about 1095.0804111004.

Adding to 1313221641 its reverse (1461223131), we get a palindrome (2774444772).

The spelling of 1313221641 in words is "one billion, three hundred thirteen million, two hundred twenty-one thousand, six hundred forty-one".