1025406625 has 8 divisors (see below), whose sum is σ = 1279707624. Its totient is φ = 820325200.

The previous prime is 1025406619. The next prime is 1025406643. The reversal of 1025406625 is 5266045201.

It can be written as a sum of positive squares in 4 ways, for example, as 12194064 + 1013212561 = 3492^2 + 31831^2 .

It is not a de Polignac number, because 1025406625 - 2¹⁵ = 1025373857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4101502 + ... + 4101751.

It is an arithmetic number, because the mean of its divisors is an integer number (159963453).

Almost surely, 2^1025406625 is an apocalyptic number.

It is an amenable number.

1025406625 is a deficient number, since it is larger than the sum of its proper divisors (254300999).

1025406625 is an frugal number, since it uses more digits than its factorization.

1025406625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8203268 (or 8203258 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1025406625 is about 32021.9709730679. The cubic root of 1025406625 is about 1008.3981486617.

The spelling of 1025406625 in words is "one billion, twenty-five million, four hundred six thousand, six hundred twenty-five".