305299346521 has 27 divisors (see below), whose sum is σ = 349061715261. Its totient is φ = 266863076064.

The previous prime is 305299346509. The next prime is 305299346549. The reversal of 305299346521 is 125643992503.

It is a happy number.

The square root of 305299346521 is 552539.

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 1698346521 + 303601000000 = 41211^2 + 551000^2 .

It is a de Polignac number, because none of the positive numbers 2^k-305299346521 is a prime.

It is a super-2 number, since 2×305299346521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (305299346551) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 136476015 + ... + 136478251.

Almost surely, 2^305299346521 is an apocalyptic number.

305299346521 is the 552539-th square number.

305299346521 is the 276270-th centered octagonal number.

It is an amenable number.

305299346521 is a deficient number, since it is larger than the sum of its proper divisors (43762368740).

305299346521 is an frugal number, since it uses more digits than its factorization.

305299346521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4538 (or 2269 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 49.

Multiplying 305299346521 by its sum of digits (49), we get a square (14959667979529 = 3867773²).

The spelling of 305299346521 in words is "three hundred five billion, two hundred ninety-nine million, three hundred forty-six thousand, five hundred twenty-one".