636950491 has 2 divisors, whose sum is σ = 636950492. Its totient is φ = 636950490.

The previous prime is 636950473. The next prime is 636950497. The reversal of 636950491 is 194059636.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636950491 is a prime.

It is not a weakly prime, because it can be changed into another prime (636950497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318475245 + 318475246.

It is an arithmetic number, because the mean of its divisors is an integer number (318475246).

Almost surely, 2^636950491 is an apocalyptic number.

636950491 is a deficient number, since it is larger than the sum of its proper divisors (1).

636950491 is an equidigital number, since it uses as much as digits as its factorization.

636950491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 636950491 is about 25237.8781001890. The cubic root of 636950491 is about 860.4029529553.

The spelling of 636950491 in words is "six hundred thirty-six million, nine hundred fifty thousand, four hundred ninety-one".