351222993 has 32 divisors (see below), whose sum is σ = 570286080. Its totient is φ = 211867920.

The previous prime is 351222967. The next prime is 351223001. The reversal of 351222993 is 399222153.

It is not a de Polignac number, because 351222993 - 2¹² = 351218897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (351222953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63580 + ... + 68882.

It is an arithmetic number, because the mean of its divisors is an integer number (17821440).

Almost surely, 2^351222993 is an apocalyptic number.

351222993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

351222993 is a deficient number, since it is larger than the sum of its proper divisors (219063087).

351222993 is a wasteful number, since it uses less digits than its factorization.

351222993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5546 (or 5540 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 351222993 is about 18740.9442931780. The cubic root of 351222993 is about 705.5497567943.

Adding to 351222993 its product of digits (29160), we get a palindrome (351252153).

The spelling of 351222993 in words is "three hundred fifty-one million, two hundred twenty-two thousand, nine hundred ninety-three".