133977331 has 4 divisors (see below), whose sum is σ = 134104432. Its totient is φ = 133850232.

The previous prime is 133977313. The next prime is 133977343. The reversal of 133977331 is 133779331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133779331 = 7 ⋅19111333.

It is a cyclic number.

It is not a de Polignac number, because 133977331 - 2⁹ = 133976819 is a prime.

It is a super-2 number, since 2×133977331² = 35899850443767122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133977131) 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, 61956 + ... + 64081.

It is an arithmetic number, because the mean of its divisors is an integer number (33526108).

Almost surely, 2^133977331 is an apocalyptic number.

133977331 is a deficient number, since it is larger than the sum of its proper divisors (127101).

133977331 is a wasteful number, since it uses less digits than its factorization.

133977331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127100.

The product of its digits is 35721, while the sum is 37.

The square root of 133977331 is about 11574.8577097086. The cubic root of 133977331 is about 511.6941367241.

The spelling of 133977331 in words is "one hundred thirty-three million, nine hundred seventy-seven thousand, three hundred thirty-one".