131601157 has 4 divisors (see below), whose sum is σ = 131626656. Its totient is φ = 131575660.

The previous prime is 131601139. The next prime is 131601167. The reversal of 131601157 is 751106131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 751106131 = 13093 ⋅57367.

It is a cyclic number.

It is not a de Polignac number, because 131601157 - 2¹¹ = 131599109 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 (131601167) 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, 1969 + ... + 16342.

It is an arithmetic number, because the mean of its divisors is an integer number (32906664).

Almost surely, 2^131601157 is an apocalyptic number.

It is an amenable number.

131601157 is a deficient number, since it is larger than the sum of its proper divisors (25499).

131601157 is an equidigital number, since it uses as much as digits as its factorization.

131601157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25498.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 131601157 is about 11471.7547480758. The cubic root of 131601157 is about 508.6509998188.

Adding to 131601157 its reverse (751106131), we get a palindrome (882707288).

The spelling of 131601157 in words is "one hundred thirty-one million, six hundred one thousand, one hundred fifty-seven".