345220007731 has 4 divisors (see below), whose sum is σ = 345226480272. Its totient is φ = 345213535192.

The previous prime is 345220007707. The next prime is 345220007761. The reversal of 345220007731 is 137700022543.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 345220007731 - 2⁹ = 345220007219 is a prime.

It is a super-2 number, since 2×345220007731² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345220007701) 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, 3155596 + ... + 3263161.

It is an arithmetic number, because the mean of its divisors is an integer number (86306620068).

Almost surely, 2^345220007731 is an apocalyptic number.

345220007731 is a deficient number, since it is larger than the sum of its proper divisors (6472541).

345220007731 is an equidigital number, since it uses as much as digits as its factorization.

345220007731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6472540.

The product of its (nonzero) digits is 35280, while the sum is 34.

The spelling of 345220007731 in words is "three hundred forty-five billion, two hundred twenty million, seven thousand, seven hundred thirty-one".