690330491 has 4 divisors (see below), whose sum is σ = 690580800. Its totient is φ = 690080184.

The previous prime is 690330481. The next prime is 690330521. The reversal of 690330491 is 194033096.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690330491 - 2¹⁸ = 690068347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690330481) 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 3 ways as a sum of consecutive naturals, for example, 120971 + ... + 126548.

It is an arithmetic number, because the mean of its divisors is an integer number (172645200).

Almost surely, 2^690330491 is an apocalyptic number.

690330491 is a deficient number, since it is larger than the sum of its proper divisors (250309).

690330491 is a wasteful number, since it uses less digits than its factorization.

690330491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250308.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 690330491 is about 26274.1411087023. The cubic root of 690330491 is about 883.7966519536.

The spelling of 690330491 in words is "six hundred ninety million, three hundred thirty thousand, four hundred ninety-one".