133387977 has 4 divisors (see below), whose sum is σ = 177850640. Its totient is φ = 88925316.

The previous prime is 133387951. The next prime is 133387981. The reversal of 133387977 is 779783331.

It is a happy number.

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 not a de Polignac number, because 133387977 - 2¹⁴ = 133371593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133387937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22231327 + ... + 22231332.

It is an arithmetic number, because the mean of its divisors is an integer number (44462660).

Almost surely, 2^133387977 is an apocalyptic number.

It is an amenable number.

133387977 is a deficient number, since it is larger than the sum of its proper divisors (44462663).

133387977 is an equidigital number, since it uses as much as digits as its factorization.

133387977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44462662.

The product of its digits is 666792, while the sum is 48.

The square root of 133387977 is about 11549.3712815893. The cubic root of 133387977 is about 510.9427353259.

The spelling of 133387977 in words is "one hundred thirty-three million, three hundred eighty-seven thousand, nine hundred seventy-seven".