131978207 has 2 divisors, whose sum is σ = 131978208. Its totient is φ = 131978206.

The previous prime is 131978183. The next prime is 131978219. The reversal of 131978207 is 702879131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131978207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131978227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65989103 + 65989104.

It is an arithmetic number, because the mean of its divisors is an integer number (65989104).

Almost surely, 2^131978207 is an apocalyptic number.

131978207 is a deficient number, since it is larger than the sum of its proper divisors (1).

131978207 is an equidigital number, since it uses as much as digits as its factorization.

131978207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 131978207 is about 11488.1768353381. The cubic root of 131978207 is about 509.1363146702.

The spelling of 131978207 in words is "one hundred thirty-one million, nine hundred seventy-eight thousand, two hundred seven".