210450778631 has 2 divisors, whose sum is σ = 210450778632. Its totient is φ = 210450778630.

The previous prime is 210450778621. The next prime is 210450778651. The reversal of 210450778631 is 136877054012.

210450778631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210450778631 is a prime.

It is a super-2 number, since 2×210450778631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210450778621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105225389315 + 105225389316.

It is an arithmetic number, because the mean of its divisors is an integer number (105225389316).

Almost surely, 2^210450778631 is an apocalyptic number.

210450778631 is a deficient number, since it is larger than the sum of its proper divisors (1).

210450778631 is an equidigital number, since it uses as much as digits as its factorization.

210450778631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 210450778631 in words is "two hundred ten billion, four hundred fifty million, seven hundred seventy-eight thousand, six hundred thirty-one".