131906237 has 2 divisors, whose sum is σ = 131906238. Its totient is φ = 131906236.

The previous prime is 131906233. The next prime is 131906249. The reversal of 131906237 is 732609131.

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., 104980516 + 26925721 = 10246^2 + 5189^2 .

It is a cyclic number.

It is not a de Polignac number, because 131906237 - 2² = 131906233 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131906231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65953118 + 65953119.

It is an arithmetic number, because the mean of its divisors is an integer number (65953119).

Almost surely, 2^131906237 is an apocalyptic number.

It is an amenable number.

131906237 is a deficient number, since it is larger than the sum of its proper divisors (1).

131906237 is an equidigital number, since it uses as much as digits as its factorization.

131906237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 131906237 is about 11485.0440573818. The cubic root of 131906237 is about 509.0437508952.

The spelling of 131906237 in words is "one hundred thirty-one million, nine hundred six thousand, two hundred thirty-seven".