133971473 has 4 divisors (see below), whose sum is σ = 134994288. Its totient is φ = 132948660.

The previous prime is 133971469. The next prime is 133971511. The reversal of 133971473 is 374179331.

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 133971473 - 2² = 133971469 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133971403) 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, 511211 + ... + 511472.

It is an arithmetic number, because the mean of its divisors is an integer number (33748572).

Almost surely, 2^133971473 is an apocalyptic number.

It is an amenable number.

133971473 is a deficient number, since it is larger than the sum of its proper divisors (1022815).

133971473 is a wasteful number, since it uses less digits than its factorization.

133971473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022814.

The product of its digits is 47628, while the sum is 38.

The square root of 133971473 is about 11574.6046584754. The cubic root of 133971473 is about 511.6866788755.

The spelling of 133971473 in words is "one hundred thirty-three million, nine hundred seventy-one thousand, four hundred seventy-three".