345516521 has 16 divisors (see below), whose sum is σ = 401915904. Its totient is φ = 290903184.

The previous prime is 345516503. The next prime is 345516541. The reversal of 345516521 is 125615543.

It is a cyclic number.

It is not a de Polignac number, because 345516521 - 2²² = 341322217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (345516541) 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 in 15 ways as a sum of consecutive naturals, for example, 206936 + ... + 208598.

It is an arithmetic number, because the mean of its divisors is an integer number (25119744).

Almost surely, 2^345516521 is an apocalyptic number.

It is an amenable number.

345516521 is a deficient number, since it is larger than the sum of its proper divisors (56399383).

345516521 is a wasteful number, since it uses less digits than its factorization.

345516521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180.

The product of its digits is 18000, while the sum is 32.

The square root of 345516521 is about 18588.0746985803. The cubic root of 345516521 is about 701.7077493625.

The spelling of 345516521 in words is "three hundred forty-five million, five hundred sixteen thousand, five hundred twenty-one".