621071617 has 8 divisors (see below), whose sum is σ = 628014600. Its totient is φ = 614154240.

The previous prime is 621071593. The next prime is 621071621. The reversal of 621071617 is 716170126.

It can be written as a sum of positive squares in 4 ways, for example, as 15376 + 621056241 = 124^2 + 24921^2 .

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 621071617 - 2¹⁹ = 620547329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621071687) 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, 44617 + ... + 56857.

It is an arithmetic number, because the mean of its divisors is an integer number (78501825).

Almost surely, 2^621071617 is an apocalyptic number.

It is an amenable number.

621071617 is a deficient number, since it is larger than the sum of its proper divisors (6942983).

621071617 is a wasteful number, since it uses less digits than its factorization.

621071617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12803.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 621071617 is about 24921.3084929343. The cubic root of 621071617 is about 853.1928896709.

The spelling of 621071617 in words is "six hundred twenty-one million, seventy-one thousand, six hundred seventeen".