1025128273 has 4 divisors (see below), whose sum is σ = 1103984308. Its totient is φ = 946272240.

The previous prime is 1025128267. The next prime is 1025128277. The reversal of 1025128273 is 3728215201.

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 121705024 + 903423249 = 11032^2 + 30057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1025128273 is a prime.

It is a super-2 number, since 2×1025128273² = 2101775952207925058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1025128277) 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, 39427998 + ... + 39428023.

It is an arithmetic number, because the mean of its divisors is an integer number (275996077).

Almost surely, 2^1025128273 is an apocalyptic number.

1025128273 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1025128273 is a deficient number, since it is larger than the sum of its proper divisors (78856035).

1025128273 is an equidigital number, since it uses as much as digits as its factorization.

1025128273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78856034.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1025128273 is about 32017.6244121890. The cubic root of 1025128273 is about 1008.3068954174.

The spelling of 1025128273 in words is "one billion, twenty-five million, one hundred twenty-eight thousand, two hundred seventy-three".