133971377 has 4 divisors (see below), whose sum is σ = 134644800. Its totient is φ = 133297956.

The previous prime is 133971371. The next prime is 133971401. The reversal of 133971377 is 773179331.

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 a cyclic number.

It is not a de Polignac number, because 133971377 - 2⁴ = 133971361 is a prime.

It is a super-2 number, since 2×133971377² = 35896659710552258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133971371) 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, 336413 + ... + 336810.

It is an arithmetic number, because the mean of its divisors is an integer number (33661200).

Almost surely, 2^133971377 is an apocalyptic number.

It is an amenable number.

133971377 is a deficient number, since it is larger than the sum of its proper divisors (673423).

133971377 is an equidigital number, since it uses as much as digits as its factorization.

133971377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673422.

The product of its digits is 83349, while the sum is 41.

The square root of 133971377 is about 11574.6005114647. The cubic root of 133971377 is about 511.6865566557.

The spelling of 133971377 in words is "one hundred thirty-three million, nine hundred seventy-one thousand, three hundred seventy-seven".