345290947 has 2 divisors, whose sum is σ = 345290948. Its totient is φ = 345290946.

The previous prime is 345290941. The next prime is 345291007. The reversal of 345290947 is 749092543.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 345290947 - 2¹¹ = 345288899 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (345290941) 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, 172645473 + 172645474.

It is an arithmetic number, because the mean of its divisors is an integer number (172645474).

Almost surely, 2^345290947 is an apocalyptic number.

345290947 is the 9933-rd centered heptagonal number.

345290947 is a deficient number, since it is larger than the sum of its proper divisors (1).

345290947 is an equidigital number, since it uses as much as digits as its factorization.

345290947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 345290947 is about 18582.0060004296. The cubic root of 345290947 is about 701.5550104213. Note that the first 3 decimals are identical.

The spelling of 345290947 in words is "three hundred forty-five million, two hundred ninety thousand, nine hundred forty-seven".