345211261 has 4 divisors (see below), whose sum is σ = 350870524. Its totient is φ = 339552000.

The previous prime is 345211241. The next prime is 345211283. The reversal of 345211261 is 162112543.

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: 162112543 = 151 ⋅1073593.

It can be written as a sum of positive squares in 2 ways, for example, as 89019225 + 256192036 = 9435^2 + 16006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-345211261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345211201) 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, 2829540 + ... + 2829661.

It is an arithmetic number, because the mean of its divisors is an integer number (87717631).

Almost surely, 2^345211261 is an apocalyptic number.

It is an amenable number.

345211261 is a deficient number, since it is larger than the sum of its proper divisors (5659263).

345211261 is an equidigital number, since it uses as much as digits as its factorization.

345211261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5659262.

The product of its digits is 1440, while the sum is 25.

The square root of 345211261 is about 18579.8617056210. The cubic root of 345211261 is about 701.5010381465.

The spelling of 345211261 in words is "three hundred forty-five million, two hundred eleven thousand, two hundred sixty-one".