1621318316 has 6 divisors (see below), whose sum is σ = 2837307060. Its totient is φ = 810659156.

The previous prime is 1621318261. The next prime is 1621318333. The reversal of 1621318316 is 6138131261.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202664786 + ... + 202664793.

It is an arithmetic number, because the mean of its divisors is an integer number (472884510).

Almost surely, 2^1621318316 is an apocalyptic number.

It is an amenable number.

1621318316 is a deficient number, since it is larger than the sum of its proper divisors (1215988744).

1621318316 is a wasteful number, since it uses less digits than its factorization.

1621318316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405329583 (or 405329581 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 1621318316 is about 40265.5971767463. The cubic root of 1621318316 is about 1174.7787882339.

Adding to 1621318316 its reverse (6138131261), we get a palindrome (7759449577).

The spelling of 1621318316 in words is "one billion, six hundred twenty-one million, three hundred eighteen thousand, three hundred sixteen".