353897981 has 2 divisors, whose sum is σ = 353897982. Its totient is φ = 353897980.

The previous prime is 353897977. The next prime is 353898037. The reversal of 353897981 is 189798353.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352312900 + 1585081 = 18770^2 + 1259^2 .

It is a cyclic number.

It is not a de Polignac number, because 353897981 - 2² = 353897977 is a prime.

It is a super-2 number, since 2×353897981² = 250487561911752722, 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 (353897911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 176948990 + 176948991.

It is an arithmetic number, because the mean of its divisors is an integer number (176948991).

Almost surely, 2^353897981 is an apocalyptic number.

It is an amenable number.

353897981 is a deficient number, since it is larger than the sum of its proper divisors (1).

353897981 is an equidigital number, since it uses as much as digits as its factorization.

353897981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 53.

The square root of 353897981 is about 18812.1764025325. The cubic root of 353897981 is about 707.3364335304.

The spelling of 353897981 in words is "three hundred fifty-three million, eight hundred ninety-seven thousand, nine hundred eighty-one".