1031661823 has 4 divisors (see below), whose sum is σ = 1031729248. Its totient is φ = 1031594400.

The previous prime is 1031661821. The next prime is 1031661871. The reversal of 1031661823 is 3281661301.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3281661301 = 523 ⋅6274687.

It is a cyclic number.

It is not a de Polignac number, because 1031661823 - 2¹ = 1031661821 is a prime.

It is a super-2 number, since 2×1031661823² = 2128652234071366658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031661821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1498 + ... + 45448.

It is an arithmetic number, because the mean of its divisors is an integer number (257932312).

Almost surely, 2^1031661823 is an apocalyptic number.

1031661823 is a deficient number, since it is larger than the sum of its proper divisors (67425).

1031661823 is an equidigital number, since it uses as much as digits as its factorization.

1031661823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67424.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1031661823 is about 32119.4928820491. The cubic root of 1031661823 is about 1010.4444741736. Note that the first 4 decimals are identical.

The spelling of 1031661823 in words is "one billion, thirty-one million, six hundred sixty-one thousand, eight hundred twenty-three".