133161749 has 4 divisors (see below), whose sum is σ = 152184864. Its totient is φ = 114138636.

The previous prime is 133161713. The next prime is 133161757. The reversal of 133161749 is 947161331.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 133161749 - 2¹² = 133157653 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 (133161349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9511547 + ... + 9511560.

It is an arithmetic number, because the mean of its divisors is an integer number (38046216).

Almost surely, 2^133161749 is an apocalyptic number.

It is an amenable number.

133161749 is a deficient number, since it is larger than the sum of its proper divisors (19023115).

133161749 is an equidigital number, since it uses as much as digits as its factorization.

133161749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19023114.

The product of its digits is 13608, while the sum is 35.

The square root of 133161749 is about 11539.5731723491. The cubic root of 133161749 is about 510.6537163689.

The spelling of 133161749 in words is "one hundred thirty-three million, one hundred sixty-one thousand, seven hundred forty-nine".