1023743891 has 4 divisors (see below), whose sum is σ = 1027035984. Its totient is φ = 1020451800.

The previous prime is 1023743887. The next prime is 1023743923. The reversal of 1023743891 is 1983473201.

1023743891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1983473201 = 1249 ⋅1588049.

It is a cyclic number.

It is not a de Polignac number, because 1023743891 - 2² = 1023743887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023743821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1645580 + ... + 1646201.

It is an arithmetic number, because the mean of its divisors is an integer number (256758996).

Almost surely, 2^1023743891 is an apocalyptic number.

1023743891 is a deficient number, since it is larger than the sum of its proper divisors (3292093).

1023743891 is an equidigital number, since it uses as much as digits as its factorization.

1023743891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292092.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1023743891 is about 31995.9980466308. The cubic root of 1023743891 is about 1007.8528024094.

The spelling of 1023743891 in words is "one billion, twenty-three million, seven hundred forty-three thousand, eight hundred ninety-one".