345550921 has 9 divisors (see below), whose sum is σ = 358436533. Its totient is φ = 333114880.

The previous prime is 345550903. The next prime is 345550927. The reversal of 345550921 is 129055543.

The square root of 345550921 is 18589.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 77246521 + 268304400 = 8789^2 + 16380^2 .

It is not a de Polignac number, because 345550921 - 2⁹ = 345550409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345550927) 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 in 8 ways as a sum of consecutive naturals, for example, 538761 + ... + 539401.

Almost surely, 2^345550921 is an apocalyptic number.

345550921 is the 18589-th square number.

345550921 is the 9295-th centered octagonal number.

It is an amenable number.

345550921 is a deficient number, since it is larger than the sum of its proper divisors (12885612).

345550921 is an frugal number, since it uses more digits than its factorization.

345550921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The cubic root of 345550921 is about 701.7310361849.

The spelling of 345550921 in words is "three hundred forty-five million, five hundred fifty thousand, nine hundred twenty-one".