133557131 has 6 divisors (see below), whose sum is σ = 136895796. Its totient is φ = 130298000.

The previous prime is 133557119. The next prime is 133557133. The reversal of 133557131 is 131755331.

It is a happy number.

It is not a de Polignac number, because 133557131 - 2²⁶ = 66448267 is a prime.

It is a super-2 number, since 2×133557131² = 35675014481902322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133557094 and 133557103.

It is not an unprimeable number, because it can be changed into a prime (133557133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38045 + ... + 41406.

It is an arithmetic number, because the mean of its divisors is an integer number (22815966).

Almost surely, 2^133557131 is an apocalyptic number.

133557131 is a deficient number, since it is larger than the sum of its proper divisors (3338665).

133557131 is an frugal number, since it uses more digits than its factorization.

133557131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79533 (or 79492 counting only the distinct ones).

The product of its digits is 4725, while the sum is 29.

The square root of 133557131 is about 11556.6920440064. The cubic root of 133557131 is about 511.1586255957.

The spelling of 133557131 in words is "one hundred thirty-three million, five hundred fifty-seven thousand, one hundred thirty-one".