1028997245 has 4 divisors (see below), whose sum is σ = 1234796700. Its totient is φ = 823197792.

The previous prime is 1028997223. The next prime is 1028997251. The reversal of 1028997245 is 5427998201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504541444 + 524455801 = 22462^2 + 22901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028997245 - 2¹² = 1028993149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1028997245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102899720 + ... + 102899729.

It is an arithmetic number, because the mean of its divisors is an integer number (308699175).

Almost surely, 2^1028997245 is an apocalyptic number.

It is an amenable number.

1028997245 is a deficient number, since it is larger than the sum of its proper divisors (205799455).

1028997245 is an equidigital number, since it uses as much as digits as its factorization.

1028997245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205799454.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 1028997245 is about 32077.9869224987. The cubic root of 1028997245 is about 1009.5737982172.

The spelling of 1028997245 in words is "one billion, twenty-eight million, nine hundred ninety-seven thousand, two hundred forty-five".