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23001535 = 53124787
BaseRepresentation
bin101011110111…
…1100110111111
31121021121011201
41113233212333
521342022120
62141000331
7366336604
oct127574677
947247151
1023001535
1111a90437
1278530a7
1349c469b
1430aa6ab
15204540a
hex15ef9bf

23001535 has 12 divisors (see below), whose sum is σ = 28526904. Its totient is φ = 17803920.

The previous prime is 23001509. The next prime is 23001551. The reversal of 23001535 is 53510032.

It is not a de Polignac number, because 23001535 - 213 = 22993343 is a prime.

It is a super-2 number, since 2×230015352 = 1058141224712450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2412 + ... + 7198.

It is an arithmetic number, because the mean of its divisors is an integer number (2377242).

Almost surely, 223001535 is an apocalyptic number.

23001535 is a deficient number, since it is larger than the sum of its proper divisors (5525369).

23001535 is an equidigital number, since it uses as much as digits as its factorization.

23001535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4854 (or 4823 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 23001535 is about 4795.9915554555. The cubic root of 23001535 is about 284.3930244181.

Adding to 23001535 its reverse (53510032), we get a palindrome (76511567).

The spelling of 23001535 in words is "twenty-three million, one thousand, five hundred thirty-five".

Divisors: 1 5 31 155 961 4787 4805 23935 148397 741985 4600307 23001535