131388229 has 4 divisors (see below), whose sum is σ = 150157984. Its totient is φ = 112618476.

The previous prime is 131388203. The next prime is 131388233. The reversal of 131388229 is 922883131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131388229 - 2¹³ = 131380037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131388289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9384867 + ... + 9384880.

It is an arithmetic number, because the mean of its divisors is an integer number (37539496).

Almost surely, 2^131388229 is an apocalyptic number.

It is an amenable number.

131388229 is a deficient number, since it is larger than the sum of its proper divisors (18769755).

131388229 is an equidigital number, since it uses as much as digits as its factorization.

131388229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18769754.

The product of its digits is 20736, while the sum is 37.

The square root of 131388229 is about 11462.4704579772. The cubic root of 131388229 is about 508.3765227361.

The spelling of 131388229 in words is "one hundred thirty-one million, three hundred eighty-eight thousand, two hundred twenty-nine".