691285086 has 24 divisors (see below), whose sum is σ = 1508565240. Its totient is φ = 228769776.

The previous prime is 691285081. The next prime is 691285099. The reversal of 691285086 is 680582196.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691285081) 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, 135645 + ... + 140648.

It is an arithmetic number, because the mean of its divisors is an integer number (62856885).

Almost surely, 2^691285086 is an apocalyptic number.

691285086 is an abundant number, since it is smaller than the sum of its proper divisors (817280154).

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

691285086 is a wasteful number, since it uses less digits than its factorization.

691285086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276440 (or 276437 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 691285086 is about 26292.3008882829. The cubic root of 691285086 is about 884.2038382203.

The spelling of 691285086 in words is "six hundred ninety-one million, two hundred eighty-five thousand, eighty-six".