131618357 has 4 divisors (see below), whose sum is σ = 141742860. Its totient is φ = 121493856.

The previous prime is 131618353. The next prime is 131618359. The reversal of 131618357 is 753816131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 753816131 = 7873 ⋅95747.

It can be written as a sum of positive squares in 2 ways, for example, as 25816561 + 105801796 = 5081^2 + 10286^2 .

It is a cyclic number.

It is not a de Polignac number, because 131618357 - 2² = 131618353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131618353) 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, 5062232 + ... + 5062257.

It is an arithmetic number, because the mean of its divisors is an integer number (35435715).

Almost surely, 2^131618357 is an apocalyptic number.

It is an amenable number.

131618357 is a deficient number, since it is larger than the sum of its proper divisors (10124503).

131618357 is a wasteful number, since it uses less digits than its factorization.

131618357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10124502.

The product of its digits is 15120, while the sum is 35.

The square root of 131618357 is about 11472.5043909340. The cubic root of 131618357 is about 508.6731587326.

The spelling of 131618357 in words is "one hundred thirty-one million, six hundred eighteen thousand, three hundred fifty-seven".