133600981 has 2 divisors, whose sum is σ = 133600982. Its totient is φ = 133600980.

The previous prime is 133600967. The next prime is 133600993. The reversal of 133600981 is 189006331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81270225 + 52330756 = 9015^2 + 7234^2 .

It is a cyclic number.

It is not a de Polignac number, because 133600981 - 2⁹ = 133600469 is a prime.

It is a super-2 number, since 2×133600981² = 35698444248324722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133604981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66800490 + 66800491.

It is an arithmetic number, because the mean of its divisors is an integer number (66800491).

Almost surely, 2^133600981 is an apocalyptic number.

It is an amenable number.

133600981 is a deficient number, since it is larger than the sum of its proper divisors (1).

133600981 is an equidigital number, since it uses as much as digits as its factorization.

133600981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 133600981 is about 11558.5890574931. The cubic root of 133600981 is about 511.2145613414.

The spelling of 133600981 in words is "one hundred thirty-three million, six hundred thousand, nine hundred eighty-one".