691542 has 24 divisors (see below), whose sum is σ = 1516944. Its totient is φ = 227664.

The previous prime is 691531. The next prime is 691553. The reversal of 691542 is 245196.

691542 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 (691531) and next prime (691553).

It is a congruent number.

It is an unprimeable number.

691542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1668 + ... + 2040.

It is an arithmetic number, because the mean of its divisors is an integer number (63206).

2⁶⁹¹⁵⁴² is an apocalyptic number.

691542 is an abundant number, since it is smaller than the sum of its proper divisors (825402).

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

691542 is a wasteful number, since it uses less digits than its factorization.

691542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 481 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 691542 is about 831.5900432304. The cubic root of 691542 is about 88.4313361876.

The spelling of 691542 in words is "six hundred ninety-one thousand, five hundred forty-two".