3125005421 has 2 divisors, whose sum is σ = 3125005422. Its totient is φ = 3125005420.

The previous prime is 3125005409. The next prime is 3125005489. The reversal of 3125005421 is 1245005213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3101376100 + 23629321 = 55690^2 + 4861^2 .

It is an emirp because it is prime and its reverse (1245005213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3125005421 - 2¹⁰ = 3125004397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3125005021) by changing a digit.

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 as a sum of consecutive naturals, namely, 1562502710 + 1562502711.

It is an arithmetic number, because the mean of its divisors is an integer number (1562502711).

Almost surely, 2^3125005421 is an apocalyptic number.

It is an amenable number.

3125005421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3125005421 is an equidigital number, since it uses as much as digits as its factorization.

3125005421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 3125005421 is about 55901.7479243717. The cubic root of 3125005421 is about 1462.0097144980.

The spelling of 3125005421 in words is "three billion, one hundred twenty-five million, five thousand, four hundred twenty-one".