215825497 has 2 divisors, whose sum is σ = 215825498. Its totient is φ = 215825496.

The previous prime is 215825461. The next prime is 215825501. The reversal of 215825497 is 794528512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215825481 + 16 = 14691^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215825497 is a prime.

It is not a weakly prime, because it can be changed into another prime (215825297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107912748 + 107912749.

It is an arithmetic number, because the mean of its divisors is an integer number (107912749).

Almost surely, 2^215825497 is an apocalyptic number.

It is an amenable number.

215825497 is a deficient number, since it is larger than the sum of its proper divisors (1).

215825497 is an equidigital number, since it uses as much as digits as its factorization.

215825497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 43.

The square root of 215825497 is about 14691.0005445511. Note that the first 3 decimals coincide. The cubic root of 215825497 is about 599.8383796168.

The spelling of 215825497 in words is "two hundred fifteen million, eight hundred twenty-five thousand, four hundred ninety-seven".