12505491 has 12 divisors (see below), whose sum is σ = 18849168. Its totient is φ = 7974384.

The previous prime is 12505481. The next prime is 12505499. The reversal of 12505491 is 19450521.

12505491 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12505491 - 2²¹ = 10408339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12505499) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30000 + ... + 30413.

It is an arithmetic number, because the mean of its divisors is an integer number (1570764).

Almost surely, 2^12505491 is an apocalyptic number.

12505491 is a deficient number, since it is larger than the sum of its proper divisors (6343677).

12505491 is a wasteful number, since it uses less digits than its factorization.

12505491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60442 (or 60439 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 12505491 is about 3536.3103653384. The cubic root of 12505491 is about 232.1134193249.

It can be divided in two parts, 12505 and 491, that added together give a square (12996 = 114²).

The spelling of 12505491 in words is "twelve million, five hundred five thousand, four hundred ninety-one".