3121354345 has 4 divisors (see below), whose sum is σ = 3745625220. Its totient is φ = 2497083472.

The previous prime is 3121354339. The next prime is 3121354351. The reversal of 3121354345 is 5434531213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5434531213 = 191 ⋅28453043.

It is an interprime number because it is at equal distance from previous prime (3121354339) and next prime (3121354351).

It can be written as a sum of positive squares in 2 ways, for example, as 1349533696 + 1771820649 = 36736^2 + 42093^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121354345 - 2³ = 3121354337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312135430 + ... + 312135439.

It is an arithmetic number, because the mean of its divisors is an integer number (936406305).

Almost surely, 2^3121354345 is an apocalyptic number.

It is an amenable number.

3121354345 is a deficient number, since it is larger than the sum of its proper divisors (624270875).

3121354345 is an equidigital number, since it uses as much as digits as its factorization.

3121354345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624270874.

The product of its digits is 21600, while the sum is 31.

The square root of 3121354345 is about 55869.0821922107. The cubic root of 3121354345 is about 1461.4401166844.

Adding to 3121354345 its reverse (5434531213), we get a palindrome (8555885558).

It can be divided in two parts, 31213 and 54345, that added together give a palindrome (85558).

The spelling of 3121354345 in words is "three billion, one hundred twenty-one million, three hundred fifty-four thousand, three hundred forty-five".