131111501 has 2 divisors, whose sum is σ = 131111502. Its totient is φ = 131111500.

The previous prime is 131111489. The next prime is 131111503. The reversal of 131111501 is 105111131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85562500 + 45549001 = 9250^2 + 6749^2 .

It is a cyclic number.

It is not a de Polignac number, because 131111501 - 2⁶ = 131111437 is a prime.

Together with 131111503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131111503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65555750 + 65555751.

It is an arithmetic number, because the mean of its divisors is an integer number (65555751).

Almost surely, 2^131111501 is an apocalyptic number.

It is an amenable number.

131111501 is a deficient number, since it is larger than the sum of its proper divisors (1).

131111501 is an equidigital number, since it uses as much as digits as its factorization.

131111501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15, while the sum is 14.

The square root of 131111501 is about 11450.3930500223. The cubic root of 131111501 is about 508.0193600926.

Adding to 131111501 its reverse (105111131), we get a palindrome (236222632).

The spelling of 131111501 in words is "one hundred thirty-one million, one hundred eleven thousand, five hundred one".