215262643 has 2 divisors, whose sum is σ = 215262644. Its totient is φ = 215262642.

The previous prime is 215262461. The next prime is 215262673. The reversal of 215262643 is 346262512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215262643 is a prime.

It is not a weakly prime, because it can be changed into another prime (215262673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107631321 + 107631322.

It is an arithmetic number, because the mean of its divisors is an integer number (107631322).

Almost surely, 2^215262643 is an apocalyptic number.

215262643 is a deficient number, since it is larger than the sum of its proper divisors (1).

215262643 is an equidigital number, since it uses as much as digits as its factorization.

215262643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 215262643 is about 14671.8316170818. The cubic root of 215262643 is about 599.3164836751.

The spelling of 215262643 in words is "two hundred fifteen million, two hundred sixty-two thousand, six hundred forty-three".