1621373317 has 8 divisors (see below), whose sum is σ = 1719532800. Its totient is φ = 1523523264.

The previous prime is 1621373311. The next prime is 1621373323. The reversal of 1621373317 is 7133731261.

It is an interprime number because it is at equal distance from previous prime (1621373311) and next prime (1621373323).

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 1621373317 - 2¹⁵ = 1621340549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621373311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66517 + ... + 87562.

It is an arithmetic number, because the mean of its divisors is an integer number (214941600).

Almost surely, 2^1621373317 is an apocalyptic number.

1621373317 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1621373317 is a deficient number, since it is larger than the sum of its proper divisors (98159483).

1621373317 is a wasteful number, since it uses less digits than its factorization.

1621373317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154715.

The product of its digits is 15876, while the sum is 34.

The square root of 1621373317 is about 40266.2801485312. The cubic root of 1621373317 is about 1174.7920723367.

The spelling of 1621373317 in words is "one billion, six hundred twenty-one million, three hundred seventy-three thousand, three hundred seventeen".