1028509325 has 6 divisors (see below), whose sum is σ = 1275351594. Its totient is φ = 822807440.

The previous prime is 1028509309. The next prime is 1028509343. The reversal of 1028509325 is 5239058201.

It can be written as a sum of positive squares in 3 ways, for example, as 54257956 + 974251369 = 7366^2 + 31213^2 .

It is not a de Polignac number, because 1028509325 - 2⁴ = 1028509309 is a prime.

It is a super-2 number, since 2×1028509325² = 2115662863223911250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20570162 + ... + 20570211.

It is an arithmetic number, because the mean of its divisors is an integer number (212558599).

Almost surely, 2^1028509325 is an apocalyptic number.

It is an amenable number.

1028509325 is a deficient number, since it is larger than the sum of its proper divisors (246842269).

1028509325 is an equidigital number, since it uses as much as digits as its factorization.

1028509325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41140383 (or 41140378 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 1028509325 is about 32070.3808053475. The cubic root of 1028509325 is about 1009.4142029971.

The spelling of 1028509325 in words is "one billion, twenty-eight million, five hundred nine thousand, three hundred twenty-five".