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1101201991 is a prime number
BaseRepresentation
bin100000110100011…
…0000001001000111
32211202002212010221
41001220300021013
54223401430431
6301134325211
736201030301
oct10150601107
92752085127
101101201991
1151566639a
12268959807
131471b1b16
14a6372971
1566a22111
hex41a30247

1101201991 has 2 divisors, whose sum is σ = 1101201992. Its totient is φ = 1101201990.

The previous prime is 1101201989. The next prime is 1101202001. The reversal of 1101201991 is 1991021011.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1101201991 - 21 = 1101201989 is a prime.

Together with 1101201989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101201931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550600995 + 550600996.

It is an arithmetic number, because the mean of its divisors is an integer number (550600996).

Almost surely, 21101201991 is an apocalyptic number.

1101201991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101201991 is an equidigital number, since it uses as much as digits as its factorization.

1101201991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 25.

The square root of 1101201991 is about 33184.3636521781. The cubic root of 1101201991 is about 1032.6559759827.

The spelling of 1101201991 in words is "one billion, one hundred one million, two hundred one thousand, nine hundred ninety-one".