1078115221 has 4 divisors (see below), whose sum is σ = 1103187712. Its totient is φ = 1053042732.

The previous prime is 1078115219. The next prime is 1078115249. The reversal of 1078115221 is 1225118701.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1225118701 = 251 ⋅4880951.

It is a cyclic number.

It is not a de Polignac number, because 1078115221 - 2¹ = 1078115219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1078115221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1078115251) 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 in 3 ways as a sum of consecutive naturals, for example, 12536181 + ... + 12536266.

It is an arithmetic number, because the mean of its divisors is an integer number (275796928).

Almost surely, 2^1078115221 is an apocalyptic number.

It is an amenable number.

1078115221 is a deficient number, since it is larger than the sum of its proper divisors (25072491).

1078115221 is an equidigital number, since it uses as much as digits as its factorization.

1078115221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25072490.

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 1078115221 is about 32834.6649290045. The cubic root of 1078115221 is about 1025.3883821872.

The spelling of 1078115221 in words is "one billion, seventy-eight million, one hundred fifteen thousand, two hundred twenty-one".