345185861 has 2 divisors, whose sum is σ = 345185862. Its totient is φ = 345185860.

The previous prime is 345185851. The next prime is 345185879. The reversal of 345185861 is 168581543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345030625 + 155236 = 18575^2 + 394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345185861 is a prime.

It is a super-2 number, since 2×345185861² = 238306557268622642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345185801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172592930 + 172592931.

It is an arithmetic number, because the mean of its divisors is an integer number (172592931).

Almost surely, 2^345185861 is an apocalyptic number.

It is an amenable number.

345185861 is a deficient number, since it is larger than the sum of its proper divisors (1).

345185861 is an equidigital number, since it uses as much as digits as its factorization.

345185861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 41.

The square root of 345185861 is about 18579.1781572813. The cubic root of 345185861 is about 701.4838326790.

The spelling of 345185861 in words is "three hundred forty-five million, one hundred eighty-five thousand, eight hundred sixty-one".