131906233 has 2 divisors, whose sum is σ = 131906234. Its totient is φ = 131906232.

The previous prime is 131906231. The next prime is 131906237. The reversal of 131906233 is 332609131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115842169 + 16064064 = 10763^2 + 4008^2 .

It is a cyclic number.

It is not a de Polignac number, because 131906233 - 2¹ = 131906231 is a prime.

Together with 131906231, it forms a pair of twin primes.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65953116 + 65953117.

It is an arithmetic number, because the mean of its divisors is an integer number (65953117).

Almost surely, 2^131906233 is an apocalyptic number.

It is an amenable number.

131906233 is a deficient number, since it is larger than the sum of its proper divisors (1).

131906233 is an equidigital number, since it uses as much as digits as its factorization.

131906233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 131906233 is about 11485.0438832422. The cubic root of 131906233 is about 509.0437457497.

The spelling of 131906233 in words is "one hundred thirty-one million, nine hundred six thousand, two hundred thirty-three".