213956887 has 2 divisors, whose sum is σ = 213956888. Its totient is φ = 213956886.

The previous prime is 213956861. The next prime is 213956927. The reversal of 213956887 is 788659312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213956887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213956887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213956857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106978443 + 106978444.

It is an arithmetic number, because the mean of its divisors is an integer number (106978444).

Almost surely, 2^213956887 is an apocalyptic number.

213956887 is a deficient number, since it is larger than the sum of its proper divisors (1).

213956887 is an equidigital number, since it uses as much as digits as its factorization.

213956887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 49.

The square root of 213956887 is about 14627.2651920993. The cubic root of 213956887 is about 598.1022324964.

It can be divided in two parts, 21395 and 6887, that added together give a palindrome (28282).

The spelling of 213956887 in words is "two hundred thirteen million, nine hundred fifty-six thousand, eight hundred eighty-seven".