2215348781 has 2 divisors, whose sum is σ = 2215348782. Its totient is φ = 2215348780.

The previous prime is 2215348747. The next prime is 2215348783. The reversal of 2215348781 is 1878435122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1655269225 + 560079556 = 40685^2 + 23666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215348781 - 2¹⁴ = 2215332397 is a prime.

It is a super-2 number, since 2×2215348781² = 9815540442956371922, which contains 22 as substring.

Together with 2215348783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2215348783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107674390 + 1107674391.

It is an arithmetic number, because the mean of its divisors is an integer number (1107674391).

Almost surely, 2^2215348781 is an apocalyptic number.

It is an amenable number.

2215348781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215348781 is an equidigital number, since it uses as much as digits as its factorization.

2215348781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 2215348781 is about 47067.4917644865. The cubic root of 2215348781 is about 1303.6090602091.

The spelling of 2215348781 in words is "two billion, two hundred fifteen million, three hundred forty-eight thousand, seven hundred eighty-one".