345906028781 has 2 divisors, whose sum is σ = 345906028782. Its totient is φ = 345906028780.

The previous prime is 345906028771. The next prime is 345906028801. The reversal of 345906028781 is 187820609543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279169573225 + 66736455556 = 528365^2 + 258334^2 .

It is a cyclic number.

It is not a de Polignac number, because 345906028781 - 2¹⁸ = 345905766637 is a prime.

It is a super-2 number, since 2×345906028781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345906028751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172953014390 + 172953014391.

It is an arithmetic number, because the mean of its divisors is an integer number (172953014391).

It is a 1-persistent number, because it is pandigital, but 2⋅345906028781 = 691812057562 is not.

Almost surely, 2^345906028781 is an apocalyptic number.

It is an amenable number.

345906028781 is a deficient number, since it is larger than the sum of its proper divisors (1).

345906028781 is an equidigital number, since it uses as much as digits as its factorization.

345906028781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 345906028781 in words is "three hundred forty-five billion, nine hundred six million, twenty-eight thousand, seven hundred eighty-one".