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1129991 is a prime number
BaseRepresentation
bin100010011111000000111
32010102001112
410103320013
5242124431
640115235
712414302
oct4237007
92112045
101129991
11701a85
12465b1b
13307445
14215b39
15174c2b
hex113e07

1129991 has 2 divisors, whose sum is σ = 1129992. Its totient is φ = 1129990.

The previous prime is 1129963. The next prime is 1130011. The reversal of 1129991 is 1999211.

It is a strong prime.

It is an emirp because it is prime and its reverse (1999211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1129991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1129951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564995 + 564996.

It is an arithmetic number, because the mean of its divisors is an integer number (564996).

21129991 is an apocalyptic number.

1129991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129991 is an equidigital number, since it uses as much as digits as its factorization.

1129991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 32.

The square root of 1129991 is about 1063.0103480211. The cubic root of 1129991 is about 104.1577672041.

The spelling of 1129991 in words is "one million, one hundred twenty-nine thousand, nine hundred ninety-one".