1222793991 has 6 divisors (see below), whose sum is σ = 1766258000. Its totient is φ = 815195988.

The previous prime is 1222793989. The next prime is 1222793993. The reversal of 1222793991 is 1993972221.

It is an interprime number because it is at equal distance from previous prime (1222793989) and next prime (1222793993).

It is not a de Polignac number, because 1222793991 - 2¹ = 1222793989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222793993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67932991 + ... + 67933008.

Almost surely, 2^1222793991 is an apocalyptic number.

1222793991 is a deficient number, since it is larger than the sum of its proper divisors (543464009).

1222793991 is a wasteful number, since it uses less digits than its factorization.

1222793991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135866005 (or 135866002 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 1222793991 is about 34968.4713849490. The cubic root of 1222793991 is about 1069.3448083690.

The spelling of 1222793991 in words is "one billion, two hundred twenty-two million, seven hundred ninety-three thousand, nine hundred ninety-one".