1031640805 has 16 divisors (see below), whose sum is σ = 1333899504. Its totient is φ = 761425920.

The previous prime is 1031640793. The next prime is 1031640829. The reversal of 1031640805 is 5080461301.

It can be written as a sum of positive squares in 8 ways, for example, as 51825601 + 979815204 = 7199^2 + 31302^2 .

It is not a de Polignac number, because 1031640805 - 2⁵ = 1031640773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186885 + ... + 192325.

It is an arithmetic number, because the mean of its divisors is an integer number (83368719).

Almost surely, 2^1031640805 is an apocalyptic number.

It is an amenable number.

1031640805 is a deficient number, since it is larger than the sum of its proper divisors (302258699).

1031640805 is a wasteful number, since it uses less digits than its factorization.

1031640805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8376.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1031640805 is about 32119.1656958894. The cubic root of 1031640805 is about 1010.4376122137.

The spelling of 1031640805 in words is "one billion, thirty-one million, six hundred forty thousand, eight hundred five".