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18989101297 = 85322261549
BaseRepresentation
bin10001101011110101…
…101011000011110001
31211000101100021221001
4101223311223003301
5302342202220142
612420134202001
71241365461235
oct215365530361
954011307831
1018989101297
118064941951
12381b4b3301
131a38122b1a
14cc1d3c5c5
157621355b7
hex46bd6b0f1

18989101297 has 4 divisors (see below), whose sum is σ = 19011363700. Its totient is φ = 18966838896.

The previous prime is 18989101291. The next prime is 18989101319. The reversal of 18989101297 is 79210198981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11600151616 + 7388949681 = 107704^2 + 85959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-18989101297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18989101291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11129922 + ... + 11131627.

It is an arithmetic number, because the mean of its divisors is an integer number (4752840925).

Almost surely, 218989101297 is an apocalyptic number.

It is an amenable number.

18989101297 is a deficient number, since it is larger than the sum of its proper divisors (22262403).

18989101297 is an equidigital number, since it uses as much as digits as its factorization.

18989101297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22262402.

The product of its (nonzero) digits is 653184, while the sum is 55.

The spelling of 18989101297 in words is "eighteen billion, nine hundred eighty-nine million, one hundred one thousand, two hundred ninety-seven".

Divisors: 1 853 22261549 18989101297