921730497 has 32 divisors (see below), whose sum is σ = 1361214720. Its totient is φ = 551823360.

The previous prime is 921730477. The next prime is 921730517. The reversal of 921730497 is 794037129.

It is an interprime number because it is at equal distance from previous prime (921730477) and next prime (921730517).

It is not a de Polignac number, because 921730497 - 2¹¹ = 921728449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921730477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 666747 + ... + 668127.

It is an arithmetic number, because the mean of its divisors is an integer number (42537960).

Almost surely, 2^921730497 is an apocalyptic number.

It is an amenable number.

921730497 is a deficient number, since it is larger than the sum of its proper divisors (439484223).

921730497 is a wasteful number, since it uses less digits than its factorization.

921730497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 921730497 is about 30360.0147727237. The cubic root of 921730497 is about 973.1982493643.

The spelling of 921730497 in words is "nine hundred twenty-one million, seven hundred thirty thousand, four hundred ninety-seven".