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12505131 = 334310771
BaseRepresentation
bin101111101101…
…000000101011
3212112022211000
4233231000223
511200131011
61124010043
7211202052
oct57550053
925468730
1012505131
117071321
124230923
13278abb2
141937399
151170356
hexbed02b

12505131 has 16 divisors (see below), whose sum is σ = 18958720. Its totient is φ = 8142120.

The previous prime is 12505117. The next prime is 12505133. The reversal of 12505131 is 13150521.

It is not a de Polignac number, because 12505131 - 215 = 12472363 is a prime.

It is a super-2 number, since 2×125051312 = 312756602654322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12505133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4225 + ... + 6546.

It is an arithmetic number, because the mean of its divisors is an integer number (1184920).

Almost surely, 212505131 is an apocalyptic number.

12505131 is a deficient number, since it is larger than the sum of its proper divisors (6453589).

12505131 is a wasteful number, since it uses less digits than its factorization.

12505131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10823 (or 10817 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 12505131 is about 3536.2594644624. The cubic root of 12505131 is about 232.1111919932. Note that the first 4 decimals are identical.

Adding to 12505131 its reverse (13150521), we get a palindrome (25655652).

The spelling of 12505131 in words is "twelve million, five hundred five thousand, one hundred thirty-one".

Divisors: 1 3 9 27 43 129 387 1161 10771 32313 96939 290817 463153 1389459 4168377 12505131