131811623 has 2 divisors, whose sum is σ = 131811624. Its totient is φ = 131811622.

The previous prime is 131811599. The next prime is 131811637. The reversal of 131811623 is 326118131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131811623 - 2¹² = 131807527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131811592 and 131811601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134811623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65905811 + 65905812.

It is an arithmetic number, because the mean of its divisors is an integer number (65905812).

Almost surely, 2^131811623 is an apocalyptic number.

131811623 is a deficient number, since it is larger than the sum of its proper divisors (1).

131811623 is an equidigital number, since it uses as much as digits as its factorization.

131811623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 131811623 is about 11480.9243094796. The cubic root of 131811623 is about 508.9220124378.

Adding to 131811623 its reverse (326118131), we get a palindrome (457929754).

The spelling of 131811623 in words is "one hundred thirty-one million, eight hundred eleven thousand, six hundred twenty-three".