131623109 has 2 divisors, whose sum is σ = 131623110. Its totient is φ = 131623108.

The previous prime is 131623103. The next prime is 131623147. The reversal of 131623109 is 901326131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123698884 + 7924225 = 11122^2 + 2815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131623109 is a prime.

It is a Chen prime.

It is equal to p_7465031 and since 131623109 and 7465031 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131623103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65811554 + 65811555.

It is an arithmetic number, because the mean of its divisors is an integer number (65811555).

Almost surely, 2^131623109 is an apocalyptic number.

It is an amenable number.

131623109 is a deficient number, since it is larger than the sum of its proper divisors (1).

131623109 is an equidigital number, since it uses as much as digits as its factorization.

131623109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 131623109 is about 11472.7114929296. The cubic root of 131623109 is about 508.6792804363.

The spelling of 131623109 in words is "one hundred thirty-one million, six hundred twenty-three thousand, one hundred nine".