215198279 has 2 divisors, whose sum is σ = 215198280. Its totient is φ = 215198278.

The previous prime is 215198261. The next prime is 215198297. The reversal of 215198279 is 972891512.

It is a happy number.

Together with next prime (215198297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (215198261) and next prime (215198297).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215198279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215198219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107599139 + 107599140.

It is an arithmetic number, because the mean of its divisors is an integer number (107599140).

Almost surely, 2^215198279 is an apocalyptic number.

215198279 is a deficient number, since it is larger than the sum of its proper divisors (1).

215198279 is an equidigital number, since it uses as much as digits as its factorization.

215198279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 44.

The square root of 215198279 is about 14669.6379982602. The cubic root of 215198279 is about 599.2567454086.

The spelling of 215198279 in words is "two hundred fifteen million, one hundred ninety-eight thousand, two hundred seventy-nine".