30197476781 has 2 divisors, whose sum is σ = 30197476782. Its totient is φ = 30197476780.

The previous prime is 30197476747. The next prime is 30197476807. The reversal of 30197476781 is 18767479103.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15510460681 + 14687016100 = 124541^2 + 121190^2 .

It is a cyclic number.

It is not a de Polignac number, because 30197476781 - 2³⁰ = 29123734957 is a prime.

It is a super-2 number, since 2×30197476781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30197476711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15098738390 + 15098738391.

It is an arithmetic number, because the mean of its divisors is an integer number (15098738391).

Almost surely, 2^30197476781 is an apocalyptic number.

It is an amenable number.

30197476781 is a deficient number, since it is larger than the sum of its proper divisors (1).

30197476781 is an equidigital number, since it uses as much as digits as its factorization.

30197476781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The spelling of 30197476781 in words is "thirty billion, one hundred ninety-seven million, four hundred seventy-six thousand, seven hundred eighty-one".