215445157 has 2 divisors, whose sum is σ = 215445158. Its totient is φ = 215445156.

The previous prime is 215445127. The next prime is 215445193. The reversal of 215445157 is 751544512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172817316 + 42627841 = 13146^2 + 6529^2 .

It is a cyclic number.

It is not a de Polignac number, because 215445157 - 2¹⁹ = 214920869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215445127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107722578 + 107722579.

It is an arithmetic number, because the mean of its divisors is an integer number (107722579).

Almost surely, 2^215445157 is an apocalyptic number.

It is an amenable number.

215445157 is a deficient number, since it is larger than the sum of its proper divisors (1).

215445157 is an equidigital number, since it uses as much as digits as its factorization.

215445157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28000, while the sum is 34.

The square root of 215445157 is about 14678.0501770501. The cubic root of 215445157 is about 599.4858159653.

Adding to 215445157 its reverse (751544512), we get a palindrome (966989669).

The spelling of 215445157 in words is "two hundred fifteen million, four hundred forty-five thousand, one hundred fifty-seven".