345609947 has 2 divisors, whose sum is σ = 345609948. Its totient is φ = 345609946.

The previous prime is 345609923. The next prime is 345609961. The reversal of 345609947 is 749906543.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (749906543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345609947 - 2⁶ = 345609883 is a prime.

It is not a weakly prime, because it can be changed into another prime (345609967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172804973 + 172804974.

It is an arithmetic number, because the mean of its divisors is an integer number (172804974).

Almost surely, 2^345609947 is an apocalyptic number.

345609947 is a deficient number, since it is larger than the sum of its proper divisors (1).

345609947 is an equidigital number, since it uses as much as digits as its factorization.

345609947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 47.

The square root of 345609947 is about 18590.5875915744. The cubic root of 345609947 is about 701.7709897927.

The spelling of 345609947 in words is "three hundred forty-five million, six hundred nine thousand, nine hundred forty-seven".