345137521 has 4 divisors (see below), whose sum is σ = 345228912. Its totient is φ = 345046132.

The previous prime is 345137509. The next prime is 345137567. The reversal of 345137521 is 125731543.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345137521 is a prime.

It is a super-3 number, since 3×345137521³ (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 (345137501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39775 + ... + 47668.

It is an arithmetic number, because the mean of its divisors is an integer number (86307228).

Almost surely, 2^345137521 is an apocalyptic number.

It is an amenable number.

345137521 is a deficient number, since it is larger than the sum of its proper divisors (91391).

345137521 is an equidigital number, since it uses as much as digits as its factorization.

345137521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91390.

The product of its digits is 12600, while the sum is 31.

The square root of 345137521 is about 18577.8771930487. The cubic root of 345137521 is about 701.4510857685.

The spelling of 345137521 in words is "three hundred forty-five million, one hundred thirty-seven thousand, five hundred twenty-one".