133361551 has 4 divisors (see below), whose sum is σ = 140380600. Its totient is φ = 126342504.

The previous prime is 133361519. The next prime is 133361573. The reversal of 133361551 is 155163331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133361551 - 2⁵ = 133361519 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 (133361051) 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, 3509496 + ... + 3509533.

It is an arithmetic number, because the mean of its divisors is an integer number (35095150).

Almost surely, 2^133361551 is an apocalyptic number.

133361551 is a deficient number, since it is larger than the sum of its proper divisors (7019049).

133361551 is an equidigital number, since it uses as much as digits as its factorization.

133361551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7019048.

The product of its digits is 4050, while the sum is 28.

The square root of 133361551 is about 11548.2271799614. The cubic root of 133361551 is about 510.9089914939.

The spelling of 133361551 in words is "one hundred thirty-three million, three hundred sixty-one thousand, five hundred fifty-one".