1023817921 has 4 divisors (see below), whose sum is σ = 1170077632. Its totient is φ = 877558212.

The previous prime is 1023817913. The next prime is 1023817931. The reversal of 1023817921 is 1297183201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1023817921 - 2³ = 1023817913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023817931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73129845 + ... + 73129858.

It is an arithmetic number, because the mean of its divisors is an integer number (292519408).

Almost surely, 2^1023817921 is an apocalyptic number.

It is an amenable number.

1023817921 is a deficient number, since it is larger than the sum of its proper divisors (146259711).

1023817921 is an equidigital number, since it uses as much as digits as its factorization.

1023817921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146259710.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 1023817921 is about 31997.1548891460. The cubic root of 1023817921 is about 1007.8770954463.

The spelling of 1023817921 in words is "one billion, twenty-three million, eight hundred seventeen thousand, nine hundred twenty-one".