133206357 has 4 divisors (see below), whose sum is σ = 177608480. Its totient is φ = 88804236.

The previous prime is 133206347. The next prime is 133206377. The reversal of 133206357 is 753602331.

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 de Polignac number, because none of the positive numbers 2^k-133206357 is a prime.

It is a super-2 number, since 2×133206357² = 35487867090422898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133206347) 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, 22201057 + ... + 22201062.

It is an arithmetic number, because the mean of its divisors is an integer number (44402120).

Almost surely, 2^133206357 is an apocalyptic number.

It is an amenable number.

133206357 is a deficient number, since it is larger than the sum of its proper divisors (44402123).

133206357 is an equidigital number, since it uses as much as digits as its factorization.

133206357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44402122.

The product of its (nonzero) digits is 11340, while the sum is 30.

The square root of 133206357 is about 11541.5058376279. The cubic root of 133206357 is about 510.7107314852.

Adding to 133206357 its reverse (753602331), we get a palindrome (886808688).

The spelling of 133206357 in words is "one hundred thirty-three million, two hundred six thousand, three hundred fifty-seven".