30780961 has 4 divisors (see below), whose sum is σ = 31202692. Its totient is φ = 30359232.

The previous prime is 30780943. The next prime is 30780979. The reversal of 30780961 is 16908703.

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

It is an interprime number because it is at equal distance from previous prime (30780943) and next prime (30780979).

It can be written as a sum of positive squares in 2 ways, for example, as 22043025 + 8737936 = 4695^2 + 2956^2 .

It is a cyclic number.

It is not a de Polignac number, because 30780961 - 2⁷ = 30780833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30780901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210756 + ... + 210901.

It is an arithmetic number, because the mean of its divisors is an integer number (7800673).

Almost surely, 2^30780961 is an apocalyptic number.

It is an amenable number.

30780961 is a deficient number, since it is larger than the sum of its proper divisors (421731).

30780961 is an equidigital number, since it uses as much as digits as its factorization.

30780961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421730.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 30780961 is about 5548.0592102104. The cubic root of 30780961 is about 313.3964395554.

The spelling of 30780961 in words is "thirty million, seven hundred eighty thousand, nine hundred sixty-one".