131523511 has 4 divisors (see below), whose sum is σ = 150312592. Its totient is φ = 112734432.

The previous prime is 131523487. The next prime is 131523523. The reversal of 131523511 is 115325131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115325131 = 929 ⋅124139.

It is a cyclic number.

It is not a de Polignac number, because 131523511 - 2⁷ = 131523383 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 (131523551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9394530 + ... + 9394543.

It is an arithmetic number, because the mean of its divisors is an integer number (37578148).

Almost surely, 2^131523511 is an apocalyptic number.

131523511 is a deficient number, since it is larger than the sum of its proper divisors (18789081).

131523511 is an equidigital number, since it uses as much as digits as its factorization.

131523511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18789080.

The product of its digits is 450, while the sum is 22.

The square root of 131523511 is about 11468.3700236782. The cubic root of 131523511 is about 508.5509437443.

Adding to 131523511 its reverse (115325131), we get a palindrome (246848642).

The spelling of 131523511 in words is "one hundred thirty-one million, five hundred twenty-three thousand, five hundred eleven".