1031155840 has 256 divisors, whose sum is σ = 3053635200. Its totient is φ = 327352320.

The previous prime is 1031155837. The next prime is 1031155843. The reversal of 1031155840 is 485511301.

It is an interprime number because it is at equal distance from previous prime (1031155837) and next prime (1031155843).

It is a super-2 number, since 2×1031155840² = 2126564732732211200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1031155799 and 1031155808.

It is not an unprimeable number, because it can be changed into a prime (1031155843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1738584 + ... + 1739176.

Almost surely, 2^1031155840 is an apocalyptic number.

1031155840 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 1031155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1526817600).

1031155840 is an abundant number, since it is smaller than the sum of its proper divisors (2022479360).

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

1031155840 is a wasteful number, since it uses less digits than its factorization.

1031155840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 1031155840 is about 32111.6153439842. The cubic root of 1031155840 is about 1010.2792548733.

The spelling of 1031155840 in words is "one billion, thirty-one million, one hundred fifty-five thousand, eight hundred forty".