812511025 has 6 divisors (see below), whose sum is σ = 1007513702. Its totient is φ = 650008800.

The previous prime is 812511013. The next prime is 812511031. The reversal of 812511025 is 520115218.

It can be written as a sum of positive squares in 3 ways, for example, as 18173169 + 794337856 = 4263^2 + 28184^2 .

It is not a de Polignac number, because 812511025 - 2¹⁹ = 811986737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 32500441 = 812511025 / (8 + 1 + 2 + 5 + 1 + 1 + 0 + 2 + 5).

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 5 ways as a sum of consecutive naturals, for example, 16250196 + ... + 16250245.

Almost surely, 2^812511025 is an apocalyptic number.

It is an amenable number.

812511025 is a deficient number, since it is larger than the sum of its proper divisors (195002677).

812511025 is a wasteful number, since it uses less digits than its factorization.

812511025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32500451 (or 32500446 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 812511025 is about 28504.5790181157. The cubic root of 812511025 is about 933.1320097940.

The spelling of 812511025 in words is "eight hundred twelve million, five hundred eleven thousand, twenty-five".