210450491 has 2 divisors, whose sum is σ = 210450492. Its totient is φ = 210450490.

The previous prime is 210450451. The next prime is 210450509. The reversal of 210450491 is 194054012.

210450491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210450491 is a prime.

It is equal to p_11625038 and since 210450491 and 11625038 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210450491.

It is not a weakly prime, because it can be changed into another prime (210450421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105225245 + 105225246.

It is an arithmetic number, because the mean of its divisors is an integer number (105225246).

Almost surely, 2^210450491 is an apocalyptic number.

210450491 is a deficient number, since it is larger than the sum of its proper divisors (1).

210450491 is an equidigital number, since it uses as much as digits as its factorization.

210450491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 210450491 is about 14506.9118353976. The cubic root of 210450491 is about 594.8169208168.

The spelling of 210450491 in words is "two hundred ten million, four hundred fifty thousand, four hundred ninety-one".