133691377 has 8 divisors (see below), whose sum is σ = 135478440. Its totient is φ = 131913600.

The previous prime is 133691339. The next prime is 133691381. The reversal of 133691377 is 773196331.

It can be written as a sum of positive squares in 4 ways, for example, as 54819216 + 78872161 = 7404^2 + 8881^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133691377 is a prime.

It is a super-2 number, since 2×133691377² = 35746768568312258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133691177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29499 + ... + 33727.

It is an arithmetic number, because the mean of its divisors is an integer number (16934805).

Almost surely, 2^133691377 is an apocalyptic number.

It is an amenable number.

133691377 is a deficient number, since it is larger than the sum of its proper divisors (1787063).

133691377 is a wasteful number, since it uses less digits than its factorization.

133691377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4643.

The product of its digits is 71442, while the sum is 40.

The square root of 133691377 is about 11562.4987351351. The cubic root of 133691377 is about 511.3298332817.

The spelling of 133691377 in words is "one hundred thirty-three million, six hundred ninety-one thousand, three hundred seventy-seven".