215142313 has 2 divisors, whose sum is σ = 215142314. Its totient is φ = 215142312.

The previous prime is 215142251. The next prime is 215142331. The reversal of 215142313 is 313241512.

It is a happy number.

Together with next prime (215142331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121594729 + 93547584 = 11027^2 + 9672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215142313 is a prime.

It is not a weakly prime, because it can be changed into another prime (215142113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107571156 + 107571157.

It is an arithmetic number, because the mean of its divisors is an integer number (107571157).

Almost surely, 2^215142313 is an apocalyptic number.

It is an amenable number.

215142313 is a deficient number, since it is larger than the sum of its proper divisors (1).

215142313 is an equidigital number, since it uses as much as digits as its factorization.

215142313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 215142313 is about 14667.7303288546. The cubic root of 215142313 is about 599.2047919095.

Adding to 215142313 its reverse (313241512), we get a palindrome (528383825).

The spelling of 215142313 in words is "two hundred fifteen million, one hundred forty-two thousand, three hundred thirteen".