30972889 has 2 divisors, whose sum is σ = 30972890. Its totient is φ = 30972888.

The previous prime is 30972883. The next prime is 30972911. The reversal of 30972889 is 98827903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23088025 + 7884864 = 4805^2 + 2808^2 .

It is a cyclic number.

It is not a de Polignac number, because 30972889 - 2¹³ = 30964697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30972883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15486444 + 15486445.

It is an arithmetic number, because the mean of its divisors is an integer number (15486445).

Almost surely, 2^30972889 is an apocalyptic number.

It is an amenable number.

30972889 is a deficient number, since it is larger than the sum of its proper divisors (1).

30972889 is an equidigital number, since it uses as much as digits as its factorization.

30972889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 30972889 is about 5565.3291906230. The cubic root of 30972889 is about 314.0464622174.

The spelling of 30972889 in words is "thirty million, nine hundred seventy-two thousand, eight hundred eighty-nine".