6201687991 has 2 divisors, whose sum is σ = 6201687992. Its totient is φ = 6201687990.

The previous prime is 6201687967. The next prime is 6201688013. The reversal of 6201687991 is 1997861026.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6201687991 - 2⁵ = 6201687959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6201687901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3100843995 + 3100843996.

It is an arithmetic number, because the mean of its divisors is an integer number (3100843996).

Almost surely, 2^6201687991 is an apocalyptic number.

6201687991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6201687991 is an equidigital number, since it uses as much as digits as its factorization.

6201687991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 6201687991 is about 78750.7967642233. The cubic root of 6201687991 is about 1837.2572549032.

The spelling of 6201687991 in words is "six billion, two hundred one million, six hundred eighty-seven thousand, nine hundred ninety-one".