1226848991 has 2 divisors, whose sum is σ = 1226848992. Its totient is φ = 1226848990.

The previous prime is 1226848969. The next prime is 1226848999. The reversal of 1226848991 is 1998486221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1226848991 - 2⁶ = 1226848927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226848999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613424495 + 613424496.

It is an arithmetic number, because the mean of its divisors is an integer number (613424496).

Almost surely, 2^1226848991 is an apocalyptic number.

1226848991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226848991 is an equidigital number, since it uses as much as digits as its factorization.

1226848991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 50.

The square root of 1226848991 is about 35026.4041974051. The cubic root of 1226848991 is about 1070.5255493191.

The spelling of 1226848991 in words is "one billion, two hundred twenty-six million, eight hundred forty-eight thousand, nine hundred ninety-one".