Search a number
-
+
19000991 is a prime number
BaseRepresentation
bin100100001111…
…0111010011111
31022202100110102
41020132322133
514331012431
61515131315
7320335322
oct110367237
938670412
1019000991
11a7a87a9
126443b3b
133c237b9
1427487b9
151a04dcb
hex121ee9f

19000991 has 2 divisors, whose sum is σ = 19000992. Its totient is φ = 19000990.

The previous prime is 19000987. The next prime is 19000997. The reversal of 19000991 is 19900091.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19000991 - 22 = 19000987 is a prime.

It is a super-2 number, since 2×190009912 = 722075317964162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19000997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9500495 + 9500496.

It is an arithmetic number, because the mean of its divisors is an integer number (9500496).

Almost surely, 219000991 is an apocalyptic number.

19000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

19000991 is an equidigital number, since it uses as much as digits as its factorization.

19000991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 19000991 is about 4359.0126175546. The cubic root of 19000991 is about 266.8448040653.

It can be divided in two parts, 19000 and 991, that added together give a palindrome (19991).

The spelling of 19000991 in words is "nineteen million, nine hundred ninety-one", and thus it is an aban number.