30470786981 has 2 divisors, whose sum is σ = 30470786982. Its totient is φ = 30470786980.

The previous prime is 30470786953. The next prime is 30470786987. The reversal of 30470786981 is 18968707403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23205952225 + 7264834756 = 152335^2 + 85234^2 .

It is a cyclic number.

It is not a de Polignac number, because 30470786981 - 2¹⁰ = 30470785957 is a prime.

It is a super-2 number, since 2×30470786981² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30470786987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15235393490 + 15235393491.

It is an arithmetic number, because the mean of its divisors is an integer number (15235393491).

Almost surely, 2^30470786981 is an apocalyptic number.

It is an amenable number.

30470786981 is a deficient number, since it is larger than the sum of its proper divisors (1).

30470786981 is an equidigital number, since it uses as much as digits as its factorization.

30470786981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 30470786981 in words is "thirty billion, four hundred seventy million, seven hundred eighty-six thousand, nine hundred eighty-one".