30643961 has 4 divisors (see below), whose sum is σ = 30802932. Its totient is φ = 30484992.

The previous prime is 30643939. The next prime is 30643967. The reversal of 30643961 is 16934603.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16934603 = 7 ⋅2419229.

It can be written as a sum of positive squares in 2 ways, for example, as 9114361 + 21529600 = 3019^2 + 4640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30643961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30643967) 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, 79196 + ... + 79581.

It is an arithmetic number, because the mean of its divisors is an integer number (7700733).

Almost surely, 2^30643961 is an apocalyptic number.

It is an amenable number.

30643961 is a deficient number, since it is larger than the sum of its proper divisors (158971).

30643961 is a wasteful number, since it uses less digits than its factorization.

30643961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158970.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 30643961 is about 5535.6987815451. The cubic root of 30643961 is about 312.9307927435.

The spelling of 30643961 in words is "thirty million, six hundred forty-three thousand, nine hundred sixty-one".