355664989 has 2 divisors, whose sum is σ = 355664990. Its totient is φ = 355664988.

The previous prime is 355664977. The next prime is 355665049. The reversal of 355664989 is 989466553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338376025 + 17288964 = 18395^2 + 4158^2 .

It is a cyclic number.

It is not a de Polignac number, because 355664989 - 2¹¹ = 355662941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (355664689) 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, 177832494 + 177832495.

It is an arithmetic number, because the mean of its divisors is an integer number (177832495).

Almost surely, 2^355664989 is an apocalyptic number.

It is an amenable number.

355664989 is a deficient number, since it is larger than the sum of its proper divisors (1).

355664989 is an equidigital number, since it uses as much as digits as its factorization.

355664989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 55.

The square root of 355664989 is about 18859.0824007956. The cubic root of 355664989 is about 708.5117201585.

It can be divided in two parts, 355664 and 989, that added together give a palindrome (356653).

The spelling of 355664989 in words is "three hundred fifty-five million, six hundred sixty-four thousand, nine hundred eighty-nine".