1224022991 has 2 divisors, whose sum is σ = 1224022992. Its totient is φ = 1224022990.

The previous prime is 1224022951. The next prime is 1224023023. The reversal of 1224022991 is 1992204221.

It is an a-pointer prime, because the next prime (1224023023) can be obtained adding 1224022991 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1224022991 - 2¹⁴ = 1224006607 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 (1224022951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612011495 + 612011496.

It is an arithmetic number, because the mean of its divisors is an integer number (612011496).

Almost surely, 2^1224022991 is an apocalyptic number.

1224022991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224022991 is an equidigital number, since it uses as much as digits as its factorization.

1224022991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1224022991 is about 34986.0399445264. The cubic root of 1224022991 is about 1069.7029457513.

The spelling of 1224022991 in words is "one billion, two hundred twenty-four million, twenty-two thousand, nine hundred ninety-one".