355121999 has 2 divisors, whose sum is σ = 355122000. Its totient is φ = 355121998.

The previous prime is 355121971. The next prime is 355122007. The reversal of 355121999 is 999121553.

It is a strong prime.

It is an emirp because it is prime and its reverse (999121553) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 355121999 - 2¹⁶ = 355056463 is a prime.

It is a super-2 number, since 2×355121999² = 252223268347512002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (355121929) 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, 177560999 + 177561000.

It is an arithmetic number, because the mean of its divisors is an integer number (177561000).

Almost surely, 2^355121999 is an apocalyptic number.

355121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

355121999 is an equidigital number, since it uses as much as digits as its factorization.

355121999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109350, while the sum is 44.

The square root of 355121999 is about 18844.6809206205. The cubic root of 355121999 is about 708.1509773837.

The spelling of 355121999 in words is "three hundred fifty-five million, one hundred twenty-one thousand, nine hundred ninety-nine".