12991542 has 16 divisors (see below), whose sum is σ = 26821632. Its totient is φ = 4190760.

The previous prime is 12991541. The next prime is 12991543. The reversal of 12991542 is 24519921.

12991542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12991541) and next prime (12991543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34738 + ... + 35109.

It is an arithmetic number, because the mean of its divisors is an integer number (1676352).

Almost surely, 2^12991542 is an apocalyptic number.

12991542 is an abundant number, since it is smaller than the sum of its proper divisors (13830090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12991542 is a wasteful number, since it uses less digits than its factorization.

12991542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69883.

The product of its digits is 6480, while the sum is 33.

The square root of 12991542 is about 3604.3781710581. The cubic root of 12991542 is about 235.0824638915.

The spelling of 12991542 in words is "twelve million, nine hundred ninety-one thousand, five hundred forty-two".