131242399 has 2 divisors, whose sum is σ = 131242400. Its totient is φ = 131242398.

The previous prime is 131242379. The next prime is 131242409. The reversal of 131242399 is 993242131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131242399 is a prime.

It is a super-3 number, since 3×131242399³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131242369) 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, 65621199 + 65621200.

It is an arithmetic number, because the mean of its divisors is an integer number (65621200).

Almost surely, 2^131242399 is an apocalyptic number.

131242399 is a deficient number, since it is larger than the sum of its proper divisors (1).

131242399 is an equidigital number, since it uses as much as digits as its factorization.

131242399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 131242399 is about 11456.1074977498. The cubic root of 131242399 is about 508.1883678959.

The spelling of 131242399 in words is "one hundred thirty-one million, two hundred forty-two thousand, three hundred ninety-nine".