345551 has 2 divisors, whose sum is σ = 345552. Its totient is φ = 345550.

The previous prime is 345547. The next prime is 345571. The reversal of 345551 is 155543.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 345551 - 2² = 345547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172775 + 172776.

It is an arithmetic number, because the mean of its divisors is an integer number (172776).

2³⁴⁵⁵⁵¹ is an apocalyptic number.

345551 is a deficient number, since it is larger than the sum of its proper divisors (1).

345551 is an equidigital number, since it uses as much as digits as its factorization.

345551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 23.

The square root of 345551 is about 587.8358614443. The cubic root of 345551 is about 70.1731089662.

It can be divided in two parts, 3 and 45551, that added together give a palindrome (45554).

The spelling of 345551 in words is "three hundred forty-five thousand, five hundred fifty-one".