8125012405 has 4 divisors (see below), whose sum is σ = 9750014892. Its totient is φ = 6500009920.

The previous prime is 8125012403. The next prime is 8125012409. The reversal of 8125012405 is 5042105218.

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 6099922404 + 2025090001 = 78102^2 + 45001^2 .

It is not a de Polignac number, because 8125012405 - 2¹ = 8125012403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8125012403) 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, 812501236 + ... + 812501245.

It is an arithmetic number, because the mean of its divisors is an integer number (2437503723).

Almost surely, 2^8125012405 is an apocalyptic number.

It is an amenable number.

8125012405 is a deficient number, since it is larger than the sum of its proper divisors (1625002487).

8125012405 is a wasteful number, since it uses less digits than its factorization.

8125012405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625002486.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 8125012405 is about 90138.8506971328. The cubic root of 8125012405 is about 2010.3639024141.

The spelling of 8125012405 in words is "eight billion, one hundred twenty-five million, twelve thousand, four hundred five".