3975751421 has 2 divisors, whose sum is σ = 3975751422. Its totient is φ = 3975751420.

The previous prime is 3975751379. The next prime is 3975751441. The reversal of 3975751421 is 1241575793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3942458521 + 33292900 = 62789^2 + 5770^2 .

It is a cyclic number.

It is not a de Polignac number, because 3975751421 - 2³⁰ = 2902009597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3975751441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1987875710 + 1987875711.

It is an arithmetic number, because the mean of its divisors is an integer number (1987875711).

Almost surely, 2^3975751421 is an apocalyptic number.

It is an amenable number.

3975751421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3975751421 is an equidigital number, since it uses as much as digits as its factorization.

3975751421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 44.

The square root of 3975751421 is about 63053.5599391501. The cubic root of 3975751421 is about 1584.1868632484.

The spelling of 3975751421 in words is "three billion, nine hundred seventy-five million, seven hundred fifty-one thousand, four hundred twenty-one".