351338611781 has 2 divisors, whose sum is σ = 351338611782. Its totient is φ = 351338611780.

The previous prime is 351338611691. The next prime is 351338611831. The reversal of 351338611781 is 187116833153.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349310550625 + 2028061156 = 591025^2 + 45034^2 .

It is an emirp because it is prime and its reverse (187116833153) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-351338611781 is a prime.

It is a super-2 number, since 2×351338611781² (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 (351338611181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175669305890 + 175669305891.

It is an arithmetic number, because the mean of its divisors is an integer number (175669305891).

Almost surely, 2^351338611781 is an apocalyptic number.

It is an amenable number.

351338611781 is a deficient number, since it is larger than the sum of its proper divisors (1).

351338611781 is an equidigital number, since it uses as much as digits as its factorization.

351338611781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The spelling of 351338611781 in words is "three hundred fifty-one billion, three hundred thirty-eight million, six hundred eleven thousand, seven hundred eighty-one".