935686921 has 15 divisors (see below), whose sum is σ = 1019289363. Its totient is φ = 858939120.

The previous prime is 935686909. The next prime is 935686931. The reversal of 935686921 is 129686539.

The square root of 935686921 is 30589.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 569347321 + 366339600 = 23861^2 + 19140^2 .

It is not a de Polignac number, because 935686921 - 2¹⁹ = 935162633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (935686931) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5169451 + ... + 5169631.

Almost surely, 2^935686921 is an apocalyptic number.

935686921 is the 30589-th square number.

935686921 is the 15295-th centered octagonal number.

It is an amenable number.

935686921 is a deficient number, since it is larger than the sum of its proper divisors (83602442).

935686921 is an frugal number, since it uses more digits than its factorization.

935686921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 194 counting only the distinct ones).

The product of its digits is 699840, while the sum is 49.

The cubic root of 935686921 is about 978.0855729646.

Multiplying 935686921 by its sum of digits (49), we get a square (45848659129 = 214123²).

It can be divided in two parts, 93568 and 6921, that added together give a square (100489 = 317²).

The spelling of 935686921 in words is "nine hundred thirty-five million, six hundred eighty-six thousand, nine hundred twenty-one".