30919621217 has 2 divisors, whose sum is σ = 30919621218. Its totient is φ = 30919621216.

The previous prime is 30919621193. The next prime is 30919621259. The reversal of 30919621217 is 71212691903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25797499456 + 5122121761 = 160616^2 + 71569^2 .

It is an emirp because it is prime and its reverse (71212691903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30919621217 is a prime.

It is a super-2 number, since 2×30919621217² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30919621277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15459810608 + 15459810609.

It is an arithmetic number, because the mean of its divisors is an integer number (15459810609).

Almost surely, 2^30919621217 is an apocalyptic number.

It is an amenable number.

30919621217 is a deficient number, since it is larger than the sum of its proper divisors (1).

30919621217 is an equidigital number, since it uses as much as digits as its factorization.

30919621217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The spelling of 30919621217 in words is "thirty billion, nine hundred nineteen million, six hundred twenty-one thousand, two hundred seventeen".