133661629 has 4 divisors (see below), whose sum is σ = 133690176. Its totient is φ = 133633084.

The previous prime is 133661617. The next prime is 133661651. The reversal of 133661629 is 926166331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 926166331 = 13709 ⋅67559.

It is a cyclic number.

It is not a de Polignac number, because 133661629 - 2¹⁷ = 133530557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133661659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5419 + ... + 17224.

It is an arithmetic number, because the mean of its divisors is an integer number (33422544).

Almost surely, 2^133661629 is an apocalyptic number.

It is an amenable number.

133661629 is a deficient number, since it is larger than the sum of its proper divisors (28547).

133661629 is an equidigital number, since it uses as much as digits as its factorization.

133661629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28546.

The product of its digits is 34992, while the sum is 37.

The square root of 133661629 is about 11561.2122634264. The cubic root of 133661629 is about 511.2919047117.

The spelling of 133661629 in words is "one hundred thirty-three million, six hundred sixty-one thousand, six hundred twenty-nine".