131229811 has 2 divisors, whose sum is σ = 131229812. Its totient is φ = 131229810.

The previous prime is 131229809. The next prime is 131229859. The reversal of 131229811 is 118922131.

It is a weak prime.

It is an emirp because it is prime and its reverse (118922131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131229811 - 2¹ = 131229809 is a prime.

Together with 131229809, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 131229811.

It is not a weakly prime, because it can be changed into another prime (131229011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65614905 + 65614906.

It is an arithmetic number, because the mean of its divisors is an integer number (65614906).

Almost surely, 2^131229811 is an apocalyptic number.

131229811 is a deficient number, since it is larger than the sum of its proper divisors (1).

131229811 is an equidigital number, since it uses as much as digits as its factorization.

131229811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 131229811 is about 11455.5580833061. The cubic root of 131229811 is about 508.1721198953.

The spelling of 131229811 in words is "one hundred thirty-one million, two hundred twenty-nine thousand, eight hundred eleven".