131421869 has 2 divisors, whose sum is σ = 131421870. Its totient is φ = 131421868.

The previous prime is 131421811. The next prime is 131421887. The reversal of 131421869 is 968124131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81902500 + 49519369 = 9050^2 + 7037^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131421869 is a prime.

It is a super-2 number, since 2×131421869² = 34543415302906322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131421809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65710934 + 65710935.

It is an arithmetic number, because the mean of its divisors is an integer number (65710935).

Almost surely, 2^131421869 is an apocalyptic number.

It is an amenable number.

131421869 is a deficient number, since it is larger than the sum of its proper divisors (1).

131421869 is an equidigital number, since it uses as much as digits as its factorization.

131421869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 131421869 is about 11463.9377615198. The cubic root of 131421869 is about 508.4199064471.

The spelling of 131421869 in words is "one hundred thirty-one million, four hundred twenty-one thousand, eight hundred sixty-nine".