1031640143 has 4 divisors (see below), whose sum is σ = 1033250208. Its totient is φ = 1030030080.

The previous prime is 1031640139. The next prime is 1031640163. The reversal of 1031640143 is 3410461301.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1031640143 - 2² = 1031640139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031640163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 804071 + ... + 805352.

It is an arithmetic number, because the mean of its divisors is an integer number (258312552).

Almost surely, 2^1031640143 is an apocalyptic number.

1031640143 is a deficient number, since it is larger than the sum of its proper divisors (1610065).

1031640143 is an equidigital number, since it uses as much as digits as its factorization.

1031640143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610064.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1031640143 is about 32119.1553905142. The cubic root of 1031640143 is about 1010.4373960824.

The spelling of 1031640143 in words is "one billion, thirty-one million, six hundred forty thousand, one hundred forty-three".