351221225 has 12 divisors (see below), whose sum is σ = 442655820. Its totient is φ = 276369600.

The previous prime is 351221203. The next prime is 351221231. The reversal of 351221225 is 522122153.

It can be written as a sum of positive squares in 6 ways, for example, as 22306729 + 328914496 = 4723^2 + 18136^2 .

It is not a de Polignac number, because 351221225 - 2¹² = 351217129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 351221225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113630 + ... + 116679.

It is an arithmetic number, because the mean of its divisors is an integer number (36887985).

Almost surely, 2^351221225 is an apocalyptic number.

It is an amenable number.

351221225 is a deficient number, since it is larger than the sum of its proper divisors (91434595).

351221225 is a wasteful number, since it uses less digits than its factorization.

351221225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230380 (or 230375 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 351221225 is about 18740.8971236705. The cubic root of 351221225 is about 705.5485729177.

Adding to 351221225 its reverse (522122153), we get a palindrome (873343378).

The spelling of 351221225 in words is "three hundred fifty-one million, two hundred twenty-one thousand, two hundred twenty-five".