1304721641 has 4 divisors (see below), whose sum is σ = 1309536384. Its totient is φ = 1299906900.

The previous prime is 1304721589. The next prime is 1304721643. The reversal of 1304721641 is 1461274031.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1304721641 - 2¹⁰ = 1304720617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1304721643) 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, 2406965 + ... + 2407506.

It is an arithmetic number, because the mean of its divisors is an integer number (327384096).

Almost surely, 2^1304721641 is an apocalyptic number.

It is an amenable number.

1304721641 is a deficient number, since it is larger than the sum of its proper divisors (4814743).

1304721641 is an equidigital number, since it uses as much as digits as its factorization.

1304721641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4814742.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1304721641 is about 36120.9307881178. The cubic root of 1304721641 is about 1092.7126110412.

Adding to 1304721641 its reverse (1461274031), we get a palindrome (2765995672).

The spelling of 1304721641 in words is "one billion, three hundred four million, seven hundred twenty-one thousand, six hundred forty-one".