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1123020191 is a prime number
BaseRepresentation
bin100001011101111…
…1110110110011111
32220021011100002102
41002323332312133
54244443121231
6303234115315
736554341226
oct10273766637
92807140072
101123020191
11526a08767
1227411bb3b
1314b8809b7
14a9211cbd
15688d1acb
hex42efed9f

1123020191 has 2 divisors, whose sum is σ = 1123020192. Its totient is φ = 1123020190.

The previous prime is 1123020139. The next prime is 1123020211. The reversal of 1123020191 is 1910203211.

It is an a-pointer prime, because the next prime (1123020211) can be obtained adding 1123020191 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1123020191 is a prime.

It is a super-2 number, since 2×11230201912 = 2522348698787352962, which contains 22 as substring.

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 (1123020091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561510095 + 561510096.

It is an arithmetic number, because the mean of its divisors is an integer number (561510096).

Almost surely, 21123020191 is an apocalyptic number.

1123020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123020191 is an equidigital number, since it uses as much as digits as its factorization.

1123020191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1123020191 is about 33511.4934164385. The cubic root of 1123020191 is about 1039.4314542226.

It can be divided in two parts, 1123020 and 191, that added together give a palindrome (1123211).

The spelling of 1123020191 in words is "one billion, one hundred twenty-three million, twenty thousand, one hundred ninety-one".