30985961 has 2 divisors, whose sum is σ = 30985962. Its totient is φ = 30985960.

The previous prime is 30985943. The next prime is 30985963. The reversal of 30985961 is 16958903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30913600 + 72361 = 5560^2 + 269^2 .

It is a cyclic number.

It is not a de Polignac number, because 30985961 - 2¹⁴ = 30969577 is a prime.

Together with 30985963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30985963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15492980 + 15492981.

It is an arithmetic number, because the mean of its divisors is an integer number (15492981).

Almost surely, 2^30985961 is an apocalyptic number.

It is an amenable number.

30985961 is a deficient number, since it is larger than the sum of its proper divisors (1).

30985961 is an equidigital number, since it uses as much as digits as its factorization.

30985961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 30985961 is about 5566.5034806420. The cubic root of 30985961 is about 314.0906367422.

The spelling of 30985961 in words is "thirty million, nine hundred eighty-five thousand, nine hundred sixty-one".