131187769 has 2 divisors, whose sum is σ = 131187770. Its totient is φ = 131187768.

The previous prime is 131187767. The next prime is 131187781. The reversal of 131187769 is 967781131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82355625 + 48832144 = 9075^2 + 6988^2 .

It is a cyclic number.

It is not a de Polignac number, because 131187769 - 2¹ = 131187767 is a prime.

It is a super-2 number, since 2×131187769² = 34420461470394722, which contains 22 as substring.

Together with 131187767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (131187767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65593884 + 65593885.

It is an arithmetic number, because the mean of its divisors is an integer number (65593885).

Almost surely, 2^131187769 is an apocalyptic number.

It is an amenable number.

131187769 is a deficient number, since it is larger than the sum of its proper divisors (1).

131187769 is an equidigital number, since it uses as much as digits as its factorization.

131187769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 43.

The square root of 131187769 is about 11453.7229318680. The cubic root of 131187769 is about 508.1178465204.

The spelling of 131187769 in words is "one hundred thirty-one million, one hundred eighty-seven thousand, seven hundred sixty-nine".