1031491823 has 2 divisors, whose sum is σ = 1031491824. Its totient is φ = 1031491822.

The previous prime is 1031491819. The next prime is 1031491829. The reversal of 1031491823 is 3281941301.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1031491823 - 2² = 1031491819 is a prime.

It is a super-4 number, since 4×1031491823⁴ (a number of 37 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1031491823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1031491829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515745911 + 515745912.

It is an arithmetic number, because the mean of its divisors is an integer number (515745912).

Almost surely, 2^1031491823 is an apocalyptic number.

1031491823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031491823 is an equidigital number, since it uses as much as digits as its factorization.

1031491823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1031491823 is about 32116.8464049632. The cubic root of 1031491823 is about 1010.3889698753.

The spelling of 1031491823 in words is "one billion, thirty-one million, four hundred ninety-one thousand, eight hundred twenty-three".