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BaseRepresentation
bin100100000010…
…0000000110001
31022112202022022
41020010000301
514314001201
61512521225
7316366136
oct110040061
938482268
1018890801
11a732a36
1263b0215
133bb55b7
14271a58d
1519d241b
hex1204031

18890801 has 2 divisors, whose sum is σ = 18890802. Its totient is φ = 18890800.

The previous prime is 18890783. The next prime is 18890813. The reversal of 18890801 is 10809881.

It can be divided in two parts, 18890 and 801, that added together give a palindrome (19691).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 2496400 = 4049^2 + 1580^2 .

It is an emirp because it is prime and its reverse (10809881) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 10806881 and 18860801.

It is a cyclic number.

It is not a de Polignac number, because 18890801 - 214 = 18874417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18890881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9445400 + 9445401.

It is an arithmetic number, because the mean of its divisors is an integer number (9445401).

Almost surely, 218890801 is an apocalyptic number.

It is an amenable number.

18890801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18890801 is an equidigital number, since it uses as much as digits as its factorization.

18890801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 18890801 is about 4346.3549095765. The cubic root of 18890801 is about 266.3279774835.

The spelling of 18890801 in words is "eighteen million, eight hundred ninety thousand, eight hundred one".