131644969 has 2 divisors, whose sum is σ = 131644970. Its totient is φ = 131644968.

The previous prime is 131644921. The next prime is 131644987. The reversal of 131644969 is 969446131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115347600 + 16297369 = 10740^2 + 4037^2 .

It is a cyclic number.

It is not a de Polignac number, because 131644969 - 2¹³ = 131636777 is a prime.

It is a super-2 number, since 2×131644969² = 34660795726021922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131644999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65822484 + 65822485.

It is an arithmetic number, because the mean of its divisors is an integer number (65822485).

Almost surely, 2^131644969 is an apocalyptic number.

It is an amenable number.

131644969 is a deficient number, since it is larger than the sum of its proper divisors (1).

131644969 is an equidigital number, since it uses as much as digits as its factorization.

131644969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 131644969 is about 11473.6641488236. The cubic root of 131644969 is about 508.7074394064.

It can be divided in two parts, 1316449 and 69, that multiplied together give a triangular number (90834981 = T₁₃₄₇₈).

The spelling of 131644969 in words is "one hundred thirty-one million, six hundred forty-four thousand, nine hundred sixty-nine".