8125012409 has 2 divisors, whose sum is σ = 8125012410. Its totient is φ = 8125012408.

The previous prime is 8125012403. The next prime is 8125012429. The reversal of 8125012409 is 9042105218.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7646628025 + 478384384 = 87445^2 + 21872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8125012409 is a prime.

It is not a weakly prime, because it can be changed into another prime (8125012403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4062506204 + 4062506205.

It is an arithmetic number, because the mean of its divisors is an integer number (4062506205).

Almost surely, 2^8125012409 is an apocalyptic number.

It is an amenable number.

8125012409 is a deficient number, since it is larger than the sum of its proper divisors (1).

8125012409 is an equidigital number, since it uses as much as digits as its factorization.

8125012409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 8125012409 is about 90138.8507193208. The cubic root of 8125012409 is about 2010.3639027440.

The spelling of 8125012409 in words is "eight billion, one hundred twenty-five million, twelve thousand, four hundred nine".