306940627781 has 2 divisors, whose sum is σ = 306940627782. Its totient is φ = 306940627780.

The previous prime is 306940627757. The next prime is 306940627789. The reversal of 306940627781 is 187726049603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221111550625 + 85829077156 = 470225^2 + 292966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-306940627781 is a prime.

It is a super-2 number, since 2×306940627781² (a number of 24 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 (306940627789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153470313890 + 153470313891.

It is an arithmetic number, because the mean of its divisors is an integer number (153470313891).

Almost surely, 2^306940627781 is an apocalyptic number.

It is an amenable number.

306940627781 is a deficient number, since it is larger than the sum of its proper divisors (1).

306940627781 is an equidigital number, since it uses as much as digits as its factorization.

306940627781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 306940627781 in words is "three hundred six billion, nine hundred forty million, six hundred twenty-seven thousand, seven hundred eighty-one".