1621344717 has 12 divisors (see below), whose sum is σ = 2355968160. Its totient is φ = 1074423048.

The previous prime is 1621344707. The next prime is 1621344719. The reversal of 1621344717 is 7174431261.

It is not a de Polignac number, because 1621344717 - 2⁶ = 1621344653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621344719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 537867 + ... + 540872.

It is an arithmetic number, because the mean of its divisors is an integer number (196330680).

Almost surely, 2^1621344717 is an apocalyptic number.

It is an amenable number.

1621344717 is a deficient number, since it is larger than the sum of its proper divisors (734623443).

1621344717 is a wasteful number, since it uses less digits than its factorization.

1621344717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078912 (or 1078909 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 1621344717 is about 40265.9250111059. The cubic root of 1621344717 is about 1174.7851647663.

Adding to 1621344717 its reverse (7174431261), we get a palindrome (8795775978).

The spelling of 1621344717 in words is "one billion, six hundred twenty-one million, three hundred forty-four thousand, seven hundred seventeen".