351441421 has 2 divisors, whose sum is σ = 351441422. Its totient is φ = 351441420.

The previous prime is 351441407. The next prime is 351441427. The reversal of 351441421 is 124144153.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275925321 + 75516100 = 16611^2 + 8690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-351441421 is a prime.

It is a super-2 number, since 2×351441421² = 247022144788998482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351441427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175720710 + 175720711.

It is an arithmetic number, because the mean of its divisors is an integer number (175720711).

Almost surely, 2^351441421 is an apocalyptic number.

It is an amenable number.

351441421 is a deficient number, since it is larger than the sum of its proper divisors (1).

351441421 is an equidigital number, since it uses as much as digits as its factorization.

351441421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 351441421 is about 18746.7709486194. The cubic root of 351441421 is about 705.6959885698.

Adding to 351441421 its reverse (124144153), we get a palindrome (475585574).

The spelling of 351441421 in words is "three hundred fifty-one million, four hundred forty-one thousand, four hundred twenty-one".