133877387431 has 4 divisors (see below), whose sum is σ = 138196012864. Its totient is φ = 129558762000.

The previous prime is 133877387417. The next prime is 133877387503. The reversal of 133877387431 is 134783778331.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133877387431 is a prime.

It is a super-2 number, since 2×133877387431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133877387401) 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, 2159312670 + ... + 2159312731.

It is an arithmetic number, because the mean of its divisors is an integer number (34549003216).

Almost surely, 2^133877387431 is an apocalyptic number.

133877387431 is a deficient number, since it is larger than the sum of its proper divisors (4318625433).

133877387431 is an equidigital number, since it uses as much as digits as its factorization.

133877387431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4318625432.

The product of its digits is 7112448, while the sum is 55.

The spelling of 133877387431 in words is "one hundred thirty-three billion, eight hundred seventy-seven million, three hundred eighty-seven thousand, four hundred thirty-one".