345512731 has 4 divisors (see below), whose sum is σ = 345571264. Its totient is φ = 345454200.

The previous prime is 345512689. The next prime is 345512747. The reversal of 345512731 is 137215543.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137215543 = 653 ⋅210131.

It is a cyclic number.

It is not a de Polignac number, because 345512731 - 2¹⁵ = 345479963 is a prime.

It is a super-2 number, since 2×345512731² = 238758094566156722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 345512693 and 345512702.

It is not an unprimeable number, because it can be changed into a prime (345522731) 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 3 ways as a sum of consecutive naturals, for example, 19275 + ... + 32596.

It is an arithmetic number, because the mean of its divisors is an integer number (86392816).

Almost surely, 2^345512731 is an apocalyptic number.

345512731 is a deficient number, since it is larger than the sum of its proper divisors (58533).

345512731 is an equidigital number, since it uses as much as digits as its factorization.

345512731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58532.

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

The square root of 345512731 is about 18587.9727512174. The cubic root of 345512731 is about 701.7051836559.

The spelling of 345512731 in words is "three hundred forty-five million, five hundred twelve thousand, seven hundred thirty-one".