1331013641 has 4 divisors (see below), whose sum is σ = 1349760384. Its totient is φ = 1312266900.

The previous prime is 1331013587. The next prime is 1331013683. The reversal of 1331013641 is 1463101331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1463101331 = 71 ⋅20607061.

It is a cyclic number.

It is not a de Polignac number, because 1331013641 - 2¹⁴ = 1330997257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331013941) 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, 9373265 + ... + 9373406.

It is an arithmetic number, because the mean of its divisors is an integer number (337440096).

Almost surely, 2^1331013641 is an apocalyptic number.

It is an amenable number.

1331013641 is a deficient number, since it is larger than the sum of its proper divisors (18746743).

1331013641 is an equidigital number, since it uses as much as digits as its factorization.

1331013641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18746742.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1331013641 is about 36483.0596441691. The cubic root of 1331013641 is about 1100.0037578384.

Adding to 1331013641 its reverse (1463101331), we get a palindrome (2794114972).

The spelling of 1331013641 in words is "one billion, three hundred thirty-one million, thirteen thousand, six hundred forty-one".