30491761 has 4 divisors (see below), whose sum is σ = 32285412. Its totient is φ = 28698112.

The previous prime is 30491759. The next prime is 30491771. The reversal of 30491761 is 16719403.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22896225 + 7595536 = 4785^2 + 2756^2 .

It is a cyclic number.

It is not a de Polignac number, because 30491761 - 2¹ = 30491759 is a prime.

It is a super-2 number, since 2×30491761² = 1859494977762242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30491701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 896800 + ... + 896833.

It is an arithmetic number, because the mean of its divisors is an integer number (8071353).

Almost surely, 2^30491761 is an apocalyptic number.

It is an amenable number.

30491761 is a deficient number, since it is larger than the sum of its proper divisors (1793651).

30491761 is a wasteful number, since it uses less digits than its factorization.

30491761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793650.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 30491761 is about 5521.9345342009. The cubic root of 30491761 is about 312.4118526852.

The spelling of 30491761 in words is "thirty million, four hundred ninety-one thousand, seven hundred sixty-one".