631321086 has 64 divisors (see below), whose sum is σ = 1409052672. Its totient is φ = 186960000.

The previous prime is 631321081. The next prime is 631321091. The reversal of 631321086 is 680123136.

It is an interprime number because it is at equal distance from previous prime (631321081) and next prime (631321091).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631321081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 768556 + ... + 769376.

It is an arithmetic number, because the mean of its divisors is an integer number (22016448).

Almost surely, 2^631321086 is an apocalyptic number.

631321086 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 631321086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (704526336).

631321086 is an abundant number, since it is smaller than the sum of its proper divisors (777731586).

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

631321086 is a wasteful number, since it uses less digits than its factorization.

631321086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 631321086 is about 25126.1036772517. The cubic root of 631321086 is about 857.8606850488.

The spelling of 631321086 in words is "six hundred thirty-one million, three hundred twenty-one thousand, eighty-six".