353911981 has 2 divisors, whose sum is σ = 353911982. Its totient is φ = 353911980.

The previous prime is 353911951. The next prime is 353911997. The reversal of 353911981 is 189119353.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 333391081 + 20520900 = 18259^2 + 4530^2 .

It is a cyclic number.

It is not a de Polignac number, because 353911981 - 2⁵ = 353911949 is a prime.

It is a super-2 number, since 2×353911981² = 250507380590688722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (353911951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 176955990 + 176955991.

It is an arithmetic number, because the mean of its divisors is an integer number (176955991).

Almost surely, 2^353911981 is an apocalyptic number.

It is an amenable number.

353911981 is a deficient number, since it is larger than the sum of its proper divisors (1).

353911981 is an equidigital number, since it uses as much as digits as its factorization.

353911981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 40.

The square root of 353911981 is about 18812.5484982764. The cubic root of 353911981 is about 707.3457606812.

The spelling of 353911981 in words is "three hundred fifty-three million, nine hundred eleven thousand, nine hundred eighty-one".