215522057 has 2 divisors, whose sum is σ = 215522058. Its totient is φ = 215522056.

The previous prime is 215521987. The next prime is 215522071. The reversal of 215522057 is 750225512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173738761 + 41783296 = 13181^2 + 6464^2 .

It is a cyclic number.

It is not a de Polignac number, because 215522057 - 2¹⁴ = 215505673 is a prime.

It is a super-2 number, since 2×215522057² = 92899514107022498, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215522257) 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, 107761028 + 107761029.

It is an arithmetic number, because the mean of its divisors is an integer number (107761029).

Almost surely, 2^215522057 is an apocalyptic number.

It is an amenable number.

215522057 is a deficient number, since it is larger than the sum of its proper divisors (1).

215522057 is an equidigital number, since it uses as much as digits as its factorization.

215522057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 29.

The square root of 215522057 is about 14680.6695010820. The cubic root of 215522057 is about 599.5571333809.

Adding to 215522057 its reverse (750225512), we get a palindrome (965747569).

The spelling of 215522057 in words is "two hundred fifteen million, five hundred twenty-two thousand, fifty-seven".