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19121047913 = 1112891348547
BaseRepresentation
bin10001110011101101…
…000000100101101001
31211100120121212122202
4101303231000211221
5303124442013123
612441210225545
71244560140242
oct216355004551
954316555582
1019121047913
118122373340
1238577252b5
131a59570646
14cd5687cc9
1576d9eaa28
hex473b40969

19121047913 has 8 divisors (see below), whose sum is σ = 20875523040. Its totient is φ = 17369272480.

The previous prime is 19121047903. The next prime is 19121047927. The reversal of 19121047913 is 31974012191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19121047913 - 218 = 19120785769 is a prime.

It is a super-2 number, since 2×191210479132 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19121047903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660095 + ... + 688452.

It is an arithmetic number, because the mean of its divisors is an integer number (2609440380).

Almost surely, 219121047913 is an apocalyptic number.

It is an amenable number.

19121047913 is a deficient number, since it is larger than the sum of its proper divisors (1754475127).

19121047913 is a wasteful number, since it uses less digits than its factorization.

19121047913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349847.

The product of its (nonzero) digits is 13608, while the sum is 38.

The spelling of 19121047913 in words is "nineteen billion, one hundred twenty-one million, forty-seven thousand, nine hundred thirteen".

Divisors: 1 11 1289 14179 1348547 14834017 1738277083 19121047913