351491612981 has 2 divisors, whose sum is σ = 351491612982. Its totient is φ = 351491612980.

The previous prime is 351491612971. The next prime is 351491613017. The reversal of 351491612981 is 189216194153.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 295528140625 + 55963472356 = 543625^2 + 236566^2 .

It is a cyclic number.

It is not a de Polignac number, because 351491612981 - 2¹⁰ = 351491611957 is a prime.

It is a super-2 number, since 2×351491612981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351491612971) 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 as a sum of consecutive naturals, namely, 175745806490 + 175745806491.

It is an arithmetic number, because the mean of its divisors is an integer number (175745806491).

Almost surely, 2^351491612981 is an apocalyptic number.

It is an amenable number.

351491612981 is a deficient number, since it is larger than the sum of its proper divisors (1).

351491612981 is an equidigital number, since it uses as much as digits as its factorization.

351491612981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 50.

The spelling of 351491612981 in words is "three hundred fifty-one billion, four hundred ninety-one million, six hundred twelve thousand, nine hundred eighty-one".