133717561 has 4 divisors (see below), whose sum is σ = 139531392. Its totient is φ = 127903732.

The previous prime is 133717553. The next prime is 133717589. The reversal of 133717561 is 165717331.

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 133717561 - 2³ = 133717553 is a prime.

It is a super-2 number, since 2×133717561² = 35760772239577442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133717501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2906881 + ... + 2906926.

It is an arithmetic number, because the mean of its divisors is an integer number (34882848).

Almost surely, 2^133717561 is an apocalyptic number.

It is an amenable number.

133717561 is a deficient number, since it is larger than the sum of its proper divisors (5813831).

133717561 is an equidigital number, since it uses as much as digits as its factorization.

133717561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5813830.

The product of its digits is 13230, while the sum is 34.

The square root of 133717561 is about 11563.6309609050. The cubic root of 133717561 is about 511.3632131119.

The spelling of 133717561 in words is "one hundred thirty-three million, seven hundred seventeen thousand, five hundred sixty-one".