133447731 has 8 divisors (see below), whose sum is σ = 178251984. Its totient is φ = 88804320.

The previous prime is 133447709. The next prime is 133447747. The reversal of 133447731 is 137744331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133447731 - 2¹⁰ = 133446707 is a prime.

It is a super-2 number, since 2×133447731² = 35616593818096722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133447692 and 133447701.

It is not an unprimeable number, because it can be changed into a prime (133447031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38260 + ... + 41601.

It is an arithmetic number, because the mean of its divisors is an integer number (22281498).

Almost surely, 2^133447731 is an apocalyptic number.

133447731 is a deficient number, since it is larger than the sum of its proper divisors (44804253).

133447731 is an equidigital number, since it uses as much as digits as its factorization.

133447731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80421.

The product of its digits is 21168, while the sum is 33.

The square root of 133447731 is about 11551.9578860036. The cubic root of 133447731 is about 511.0190198483.

The spelling of 133447731 in words is "one hundred thirty-three million, four hundred forty-seven thousand, seven hundred thirty-one".