351221231 has 2 divisors, whose sum is σ = 351221232. Its totient is φ = 351221230.

The previous prime is 351221203. The next prime is 351221239. The reversal of 351221231 is 132122153.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-351221231 is a prime.

It is a super-2 number, since 2×351221231² = 246712706210310722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351221239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175610615 + 175610616.

It is an arithmetic number, because the mean of its divisors is an integer number (175610616).

Almost surely, 2^351221231 is an apocalyptic number.

351221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

351221231 is an equidigital number, since it uses as much as digits as its factorization.

351221231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 20.

The square root of 351221231 is about 18740.8972837482. The cubic root of 351221231 is about 705.5485769354.

Adding to 351221231 its reverse (132122153), we get a palindrome (483343384).

The spelling of 351221231 in words is "three hundred fifty-one million, two hundred twenty-one thousand, two hundred thirty-one".