345056989 has 2 divisors, whose sum is σ = 345056990. Its totient is φ = 345056988.

The previous prime is 345056969. The next prime is 345057029. The reversal of 345056989 is 989650543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183385764 + 161671225 = 13542^2 + 12715^2 .

It is a cyclic number.

It is not a de Polignac number, because 345056989 - 2¹⁵ = 345024221 is a prime.

It is a super-2 number, since 2×345056989² = 238128651315492242, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345056909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172528494 + 172528495.

It is an arithmetic number, because the mean of its divisors is an integer number (172528495).

Almost surely, 2^345056989 is an apocalyptic number.

It is an amenable number.

345056989 is a deficient number, since it is larger than the sum of its proper divisors (1).

345056989 is an equidigital number, since it uses as much as digits as its factorization.

345056989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 345056989 is about 18575.7096499703. The cubic root of 345056989 is about 701.3965242777.

The spelling of 345056989 in words is "three hundred forty-five million, fifty-six thousand, nine hundred eighty-nine".