345580421 has 2 divisors, whose sum is σ = 345580422. Its totient is φ = 345580420.

The previous prime is 345580399. The next prime is 345580427. The reversal of 345580421 is 124085543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 276856321 + 68724100 = 16639^2 + 8290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345580421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345580427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172790210 + 172790211.

It is an arithmetic number, because the mean of its divisors is an integer number (172790211).

Almost surely, 2^345580421 is an apocalyptic number.

It is an amenable number.

345580421 is a deficient number, since it is larger than the sum of its proper divisors (1).

345580421 is an equidigital number, since it uses as much as digits as its factorization.

345580421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 345580421 is about 18589.7934630808. The cubic root of 345580421 is about 701.7510047580.

The spelling of 345580421 in words is "three hundred forty-five million, five hundred eighty thousand, four hundred twenty-one".