133981669 has 2 divisors, whose sum is σ = 133981670. Its totient is φ = 133981668.

The previous prime is 133981667. The next prime is 133981723. The reversal of 133981669 is 966189331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133056225 + 925444 = 11535^2 + 962^2 .

It is a cyclic number.

It is not a de Polignac number, because 133981669 - 2¹ = 133981667 is a prime.

It is a super-2 number, since 2×133981669² = 35902175256051122, which contains 22 as substring.

Together with 133981667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133981663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66990834 + 66990835.

It is an arithmetic number, because the mean of its divisors is an integer number (66990835).

Almost surely, 2^133981669 is an apocalyptic number.

It is an amenable number.

133981669 is a deficient number, since it is larger than the sum of its proper divisors (1).

133981669 is an equidigital number, since it uses as much as digits as its factorization.

133981669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 133981669 is about 11575.0450971044. The cubic root of 133981669 is about 511.6996593131.

The spelling of 133981669 in words is "one hundred thirty-three million, nine hundred eighty-one thousand, six hundred sixty-nine".