345213257 has 4 divisors (see below), whose sum is σ = 345254016. Its totient is φ = 345172500.

The previous prime is 345213251. The next prime is 345213269. The reversal of 345213257 is 752312543.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 345213257 - 2²⁸ = 76777801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345213251) 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, 2369 + ... + 26382.

It is an arithmetic number, because the mean of its divisors is an integer number (86313504).

Almost surely, 2^345213257 is an apocalyptic number.

It is an amenable number.

345213257 is a deficient number, since it is larger than the sum of its proper divisors (40759).

345213257 is a wasteful number, since it uses less digits than its factorization.

345213257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40758.

The product of its digits is 25200, while the sum is 32.

The square root of 345213257 is about 18579.9154196137. The cubic root of 345213257 is about 701.5023901625.

The spelling of 345213257 in words is "three hundred forty-five million, two hundred thirteen thousand, two hundred fifty-seven".