621742857931 has 8 divisors (see below), whose sum is σ = 678999785184. Its totient is φ = 565833152640.

The previous prime is 621742857917. The next prime is 621742857937. The reversal of 621742857931 is 139758247126.

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 621742857931 - 2²⁵ = 621709303499 is a prime.

It is a super-3 number, since 3×621742857931³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621742857937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336804526 + ... + 336806371.

It is an arithmetic number, because the mean of its divisors is an integer number (84874973148).

Almost surely, 2^621742857931 is an apocalyptic number.

621742857931 is a deficient number, since it is larger than the sum of its proper divisors (57256927253).

621742857931 is a wasteful number, since it uses less digits than its factorization.

621742857931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673610981.

The product of its digits is 5080320, while the sum is 55.

The spelling of 621742857931 in words is "six hundred twenty-one billion, seven hundred forty-two million, eight hundred fifty-seven thousand, nine hundred thirty-one".