133557457 has 32 divisors (see below), whose sum is σ = 160876800. Its totient is φ = 109486080.

The previous prime is 133557427. The next prime is 133557467. The reversal of 133557457 is 754755331.

It is a happy number.

It is not a de Polignac number, because 133557457 - 2⁷ = 133557329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133557407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671044 + ... + 671242.

It is an arithmetic number, because the mean of its divisors is an integer number (5027400).

Almost surely, 2^133557457 is an apocalyptic number.

133557457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

133557457 is a deficient number, since it is larger than the sum of its proper divisors (27319343).

133557457 is a wasteful number, since it uses less digits than its factorization.

133557457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

The product of its digits is 220500, while the sum is 40.

The square root of 133557457 is about 11556.7061483798. The cubic root of 133557457 is about 511.1590414916.

The spelling of 133557457 in words is "one hundred thirty-three million, five hundred fifty-seven thousand, four hundred fifty-seven".