207942991 has 2 divisors, whose sum is σ = 207942992. Its totient is φ = 207942990.

The previous prime is 207942967. The next prime is 207943003. The reversal of 207942991 is 199249702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 207942991 - 2²¹ = 205845839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (207942391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103971495 + 103971496.

It is an arithmetic number, because the mean of its divisors is an integer number (103971496).

Almost surely, 2^207942991 is an apocalyptic number.

207942991 is a deficient number, since it is larger than the sum of its proper divisors (1).

207942991 is an equidigital number, since it uses as much as digits as its factorization.

207942991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 207942991 is about 14420.2285349435. The cubic root of 207942991 is about 592.4450776653.

The spelling of 207942991 in words is "two hundred seven million, nine hundred forty-two thousand, nine hundred ninety-one".