131305557 has 8 divisors (see below), whose sum is σ = 175127680. Its totient is φ = 87510240.

The previous prime is 131305549. The next prime is 131305567. The reversal of 131305557 is 755503131.

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

It is not a de Polignac number, because 131305557 - 2³ = 131305549 is a prime.

It is a super-2 number, since 2×131305557² = 34482298598160498, which 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 (131305547) 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, 13044 + ... + 20802.

It is an arithmetic number, because the mean of its divisors is an integer number (21890960).

Almost surely, 2^131305557 is an apocalyptic number.

It is an amenable number.

131305557 is a deficient number, since it is larger than the sum of its proper divisors (43822123).

131305557 is an equidigital number, since it uses as much as digits as its factorization.

131305557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13403.

The product of its (nonzero) digits is 7875, while the sum is 30.

The square root of 131305557 is about 11458.8636871201. The cubic root of 131305557 is about 508.2698736034.

Adding to 131305557 its reverse (755503131), we get a palindrome (886808688).

The spelling of 131305557 in words is "one hundred thirty-one million, three hundred five thousand, five hundred fifty-seven".