1025990605 has 4 divisors (see below), whose sum is σ = 1231188732. Its totient is φ = 820792480.

The previous prime is 1025990587. The next prime is 1025990627. The reversal of 1025990605 is 5060995201.

1025990605 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 630060201 + 395930404 = 25101^2 + 19898^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1025990605 is a prime.

It is a Duffinian number.

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, 102599056 + ... + 102599065.

It is an arithmetic number, because the mean of its divisors is an integer number (307797183).

Almost surely, 2^1025990605 is an apocalyptic number.

It is an amenable number.

1025990605 is a deficient number, since it is larger than the sum of its proper divisors (205198127).

1025990605 is an equidigital number, since it uses as much as digits as its factorization.

1025990605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205198126.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 1025990605 is about 32031.0881020299. The cubic root of 1025990605 is about 1008.5895434963.

The spelling of 1025990605 in words is "one billion, twenty-five million, nine hundred ninety thousand, six hundred five".