355601681 has 2 divisors, whose sum is σ = 355601682. Its totient is φ = 355601680.

The previous prime is 355601633. The next prime is 355601693. The reversal of 355601681 is 186106553.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350288656 + 5313025 = 18716^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 355601681 - 2¹⁴ = 355585297 is a prime.

It is a super-2 number, since 2×355601681² = 252905111060051522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (355601581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177800840 + 177800841.

It is an arithmetic number, because the mean of its divisors is an integer number (177800841).

Almost surely, 2^355601681 is an apocalyptic number.

It is an amenable number.

355601681 is a deficient number, since it is larger than the sum of its proper divisors (1).

355601681 is an equidigital number, since it uses as much as digits as its factorization.

355601681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 355601681 is about 18857.4038775225. The cubic root of 355601681 is about 708.4696795464.

The spelling of 355601681 in words is "three hundred fifty-five million, six hundred one thousand, six hundred eighty-one".