345131521 has 8 divisors (see below), whose sum is σ = 396074624. Its totient is φ = 294598080.

The previous prime is 345131519. The next prime is 345131551. The reversal of 345131521 is 125131543.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 345131521 - 2¹ = 345131519 is a prime.

It is a super-3 number, since 3×345131521³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345131551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100605 + ... + 103978.

It is an arithmetic number, because the mean of its divisors is an integer number (49509328).

Almost surely, 2^345131521 is an apocalyptic number.

It is an amenable number.

345131521 is a deficient number, since it is larger than the sum of its proper divisors (50943103).

345131521 is a wasteful number, since it uses less digits than its factorization.

345131521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204831.

The product of its digits is 1800, while the sum is 25.

The square root of 345131521 is about 18577.7157099575. The cubic root of 345131521 is about 701.4470209821.

It can be divided in two parts, 3 and 45131521, that added together give a square (45131524 = 6718²).

The spelling of 345131521 in words is "three hundred forty-five million, one hundred thirty-one thousand, five hundred twenty-one".