6991542 has 32 divisors (see below), whose sum is σ = 15903360. Its totient is φ = 2275560.

The previous prime is 6991541. The next prime is 6991549. The reversal of 6991542 is 2451996.

It is a junction number, because it is equal to n+sod(n) for n = 6991497 and 6991506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 817 + ... + 3827.

It is an arithmetic number, because the mean of its divisors is an integer number (496980).

Almost surely, 2^6991542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6991542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7951680).

6991542 is an abundant number, since it is smaller than the sum of its proper divisors (8911818).

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

6991542 is a wasteful number, since it uses less digits than its factorization.

6991542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3065 (or 3059 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 6991542 is about 2644.1524161818. The cubic root of 6991542 is about 191.2160416447.

The spelling of 6991542 in words is "six million, nine hundred ninety-one thousand, five hundred forty-two".