215651713 has 2 divisors, whose sum is σ = 215651714. Its totient is φ = 215651712.

The previous prime is 215651701. The next prime is 215651719. The reversal of 215651713 is 317156512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179747649 + 35904064 = 13407^2 + 5992^2 .

It is a cyclic number.

It is not a de Polignac number, because 215651713 - 2⁹ = 215651201 is a prime.

It is a super-2 number, since 2×215651713² = 93011322639668738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215651719) 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, 107825856 + 107825857.

It is an arithmetic number, because the mean of its divisors is an integer number (107825857).

Almost surely, 2^215651713 is an apocalyptic number.

It is an amenable number.

215651713 is a deficient number, since it is larger than the sum of its proper divisors (1).

215651713 is an equidigital number, since it uses as much as digits as its factorization.

215651713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 31.

The square root of 215651713 is about 14685.0847120471. The cubic root of 215651713 is about 599.6773385508.

The spelling of 215651713 in words is "two hundred fifteen million, six hundred fifty-one thousand, seven hundred thirteen".