30117661 has 4 divisors (see below), whose sum is σ = 34420192. Its totient is φ = 25815132.

The previous prime is 30117643. The next prime is 30117677. The reversal of 30117661 is 16671103.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16671103 = 2063 ⋅8081.

It is not a de Polignac number, because 30117661 - 2¹⁵ = 30084893 is a prime.

It is a super-2 number, since 2×30117661² = 1814147008221842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30117601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151255 + ... + 2151268.

It is an arithmetic number, because the mean of its divisors is an integer number (8605048).

Almost surely, 2^30117661 is an apocalyptic number.

It is an amenable number.

30117661 is a deficient number, since it is larger than the sum of its proper divisors (4302531).

30117661 is an equidigital number, since it uses as much as digits as its factorization.

30117661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302530.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 30117661 is about 5487.9559947215. The cubic root of 30117661 is about 311.1289429925.

Adding to 30117661 its reverse (16671103), we get a palindrome (46788764).

The spelling of 30117661 in words is "thirty million, one hundred seventeen thousand, six hundred sixty-one".