12545991 has 6 divisors (see below), whose sum is σ = 18122000. Its totient is φ = 8363988.

The previous prime is 12545989. The next prime is 12545993. The reversal of 12545991 is 19954521.

12545991 is a `hidden beast` number, since 12 + 54 + 599 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (12545989) and next prime (12545993).

It is not a de Polignac number, because 12545991 - 2¹ = 12545989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12545993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 696991 + ... + 697008.

Almost surely, 2^12545991 is an apocalyptic number.

12545991 is a deficient number, since it is larger than the sum of its proper divisors (5576009).

12545991 is a wasteful number, since it uses less digits than its factorization.

12545991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394005 (or 1394002 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 12545991 is about 3542.0320438980. The cubic root of 12545991 is about 232.3637217326.

The spelling of 12545991 in words is "twelve million, five hundred forty-five thousand, nine hundred ninety-one".