1028391193 has 4 divisors (see below), whose sum is σ = 1042875648. Its totient is φ = 1013906740.

The previous prime is 1028391167. The next prime is 1028391197. The reversal of 1028391193 is 3911938201.

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 1028391193 - 2¹³ = 1028383001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028391197) 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, 7242121 + ... + 7242262.

It is an arithmetic number, because the mean of its divisors is an integer number (260718912).

Almost surely, 2^1028391193 is an apocalyptic number.

It is an amenable number.

1028391193 is a deficient number, since it is larger than the sum of its proper divisors (14484455).

1028391193 is an equidigital number, since it uses as much as digits as its factorization.

1028391193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14484454.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1028391193 is about 32068.5389907305. The cubic root of 1028391193 is about 1009.3755552566.

The spelling of 1028391193 in words is "one billion, twenty-eight million, three hundred ninety-one thousand, one hundred ninety-three".