1725128387 has 2 divisors, whose sum is σ = 1725128388. Its totient is φ = 1725128386.

The previous prime is 1725128371. The next prime is 1725128401. The reversal of 1725128387 is 7838215271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1725128387 - 2⁴ = 1725128371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1725128347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862564193 + 862564194.

It is an arithmetic number, because the mean of its divisors is an integer number (862564194).

Almost surely, 2^1725128387 is an apocalyptic number.

1725128387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1725128387 is an equidigital number, since it uses as much as digits as its factorization.

1725128387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 44.

The square root of 1725128387 is about 41534.6648836848. The cubic root of 1725128387 is about 1199.3349062118.

The spelling of 1725128387 in words is "one billion, seven hundred twenty-five million, one hundred twenty-eight thousand, three hundred eighty-seven".