215257487 has 2 divisors, whose sum is σ = 215257488. Its totient is φ = 215257486.

The previous prime is 215257463. The next prime is 215257543. The reversal of 215257487 is 784752512.

215257487 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 not a de Polignac number, because 215257487 - 2¹² = 215253391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215257187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107628743 + 107628744.

It is an arithmetic number, because the mean of its divisors is an integer number (107628744).

Almost surely, 2^215257487 is an apocalyptic number.

215257487 is a deficient number, since it is larger than the sum of its proper divisors (1).

215257487 is an equidigital number, since it uses as much as digits as its factorization.

215257487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156800, while the sum is 41.

The square root of 215257487 is about 14671.6559051799. The cubic root of 215257487 is about 599.3116986670.

The spelling of 215257487 in words is "two hundred fifteen million, two hundred fifty-seven thousand, four hundred eighty-seven".