355661881 has 3 divisors (see below), whose sum is σ = 355680741. Its totient is φ = 355643022.

The previous prime is 355661851. The next prime is 355661897. The reversal of 355661881 is 188166553.

The square root of 355661881 is 18859.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 355661881 - 2⁷ = 355661753 is a prime.

It is a super-3 number, since 3×355661881³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (355661821) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9430 + ... + 28288.

It is an arithmetic number, because the mean of its divisors is an integer number (118560247).

Almost surely, 2^355661881 is an apocalyptic number.

355661881 is the 18859-th square number.

355661881 is the 9430-th centered octagonal number.

It is an amenable number.

355661881 is a deficient number, since it is larger than the sum of its proper divisors (18860).

355661881 is an frugal number, since it uses more digits than its factorization.

355661881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37718 (or 18859 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The cubic root of 355661881 is about 708.5096563617.

The spelling of 355661881 in words is "three hundred fifty-five million, six hundred sixty-one thousand, eight hundred eighty-one".