1031431320 has 160 divisors (see below), whose sum is σ = 3617745120. Its totient is φ = 263070720.

The previous prime is 1031431307. The next prime is 1031431337. The reversal of 1031431320 is 231341301.

1031431320 is a `hidden beast` number, since 1 + 0 + 314 + 31 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1031431293 and 1031431302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 67600 + ... + 81440.

It is an arithmetic number, because the mean of its divisors is an integer number (22610907).

Almost surely, 2^1031431320 is an apocalyptic number.

1031431320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1031431320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1808872560).

1031431320 is an abundant number, since it is smaller than the sum of its proper divisors (2586313800).

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

1031431320 is a wasteful number, since it uses less digits than its factorization.

1031431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13887 (or 13874 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1031431320 is about 32115.9044711495. The cubic root of 1031431320 is about 1010.3692144241.

Adding to 1031431320 its reverse (231341301), we get a palindrome (1262772621).

The spelling of 1031431320 in words is "one billion, thirty-one million, four hundred thirty-one thousand, three hundred twenty".