345945557 has 2 divisors, whose sum is σ = 345945558. Its totient is φ = 345945556.

The previous prime is 345945547. The next prime is 345945629. The reversal of 345945557 is 755549543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226021156 + 119924401 = 15034^2 + 10951^2 .

It is a cyclic number.

It is not a de Polignac number, because 345945557 - 2⁴ = 345945541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345945527) 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, 172972778 + 172972779.

It is an arithmetic number, because the mean of its divisors is an integer number (172972779).

Almost surely, 2^345945557 is an apocalyptic number.

It is an amenable number.

345945557 is a deficient number, since it is larger than the sum of its proper divisors (1).

345945557 is an equidigital number, since it uses as much as digits as its factorization.

345945557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890000, while the sum is 47.

The square root of 345945557 is about 18599.6117432596. The cubic root of 345945557 is about 701.9980715742.

The spelling of 345945557 in words is "three hundred forty-five million, nine hundred forty-five thousand, five hundred fifty-seven".