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13991017 = 17823001
BaseRepresentation
bin110101010111…
…110001101001
3222022211001211
4311113301221
512040203032
61215513121
7226631065
oct65276151
928284054
1013991017
117996727
1248287a1
132b8b311
141c02aa5
151365747
hexd57c69

13991017 has 4 divisors (see below), whose sum is σ = 14814036. Its totient is φ = 13168000.

The previous prime is 13991009. The next prime is 13991041. The reversal of 13991017 is 71019931.

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 4405801 + 9585216 = 2099^2 + 3096^2 .

It is a cyclic number.

It is not a de Polignac number, because 13991017 - 23 = 13991009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13991017.

It is not an unprimeable number, because it can be changed into a prime (13991057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411484 + ... + 411517.

It is an arithmetic number, because the mean of its divisors is an integer number (3703509).

Almost surely, 213991017 is an apocalyptic number.

13991017 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13991017 is a deficient number, since it is larger than the sum of its proper divisors (823019).

13991017 is an equidigital number, since it uses as much as digits as its factorization.

13991017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823018.

The product of its (nonzero) digits is 1701, while the sum is 31.

The square root of 13991017 is about 3740.4567902864. The cubic root of 13991017 is about 240.9626670361.

The spelling of 13991017 in words is "thirteen million, nine hundred ninety-one thousand, seventeen".

Divisors: 1 17 823001 13991017