215263189 has 2 divisors, whose sum is σ = 215263190. Its totient is φ = 215263188.

The previous prime is 215263109. The next prime is 215263199. The reversal of 215263189 is 981362512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215208900 + 54289 = 14670^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 215263189 - 2¹¹ = 215261141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215263109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107631594 + 107631595.

It is an arithmetic number, because the mean of its divisors is an integer number (107631595).

Almost surely, 2^215263189 is an apocalyptic number.

It is an amenable number.

215263189 is a deficient number, since it is larger than the sum of its proper divisors (1).

215263189 is an equidigital number, since it uses as much as digits as its factorization.

215263189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 215263189 is about 14671.8502241537. The cubic root of 215263189 is about 599.3169903841.

It can be divided in two parts, 2152 and 63189, that added together give a triangular number (65341 = T₃₆₁).

The spelling of 215263189 in words is "two hundred fifteen million, two hundred sixty-three thousand, one hundred eighty-nine".