136557381 has 8 divisors (see below), whose sum is σ = 182181024. Its totient is φ = 90986000.

The previous prime is 136557373. The next prime is 136557383. The reversal of 136557381 is 183755631.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 136557381 - 2³ = 136557373 is a prime.

It is a super-2 number, since 2×136557381² = 37295836611158322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136557383) 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, 6495 + ... + 17756.

It is an arithmetic number, because the mean of its divisors is an integer number (22772628).

Almost surely, 2^136557381 is an apocalyptic number.

It is an amenable number.

136557381 is a deficient number, since it is larger than the sum of its proper divisors (45623643).

136557381 is a wasteful number, since it uses less digits than its factorization.

136557381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26131.

The product of its digits is 75600, while the sum is 39.

The square root of 136557381 is about 11685.7768676284. The cubic root of 136557381 is about 514.9579014823.

The spelling of 136557381 in words is "one hundred thirty-six million, five hundred fifty-seven thousand, three hundred eighty-one".