1331020641 has 8 divisors (see below), whose sum is σ = 1808179200. Its totient is φ = 870604592.

The previous prime is 1331020637. The next prime is 1331020651. The reversal of 1331020641 is 1460201331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1331020641 - 2² = 1331020637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1331020601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4185441 + ... + 4185758.

It is an arithmetic number, because the mean of its divisors is an integer number (226022400).

Almost surely, 2^1331020641 is an apocalyptic number.

It is an amenable number.

1331020641 is a deficient number, since it is larger than the sum of its proper divisors (477158559).

1331020641 is an equidigital number, since it uses as much as digits as its factorization.

1331020641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8371255.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1331020641 is about 36483.1555789792. The cubic root of 1331020641 is about 1100.0056861965.

Adding to 1331020641 its reverse (1460201331), we get a palindrome (2791221972).

The spelling of 1331020641 in words is "one billion, three hundred thirty-one million, twenty thousand, six hundred forty-one".