3951285421 has 2 divisors, whose sum is σ = 3951285422. Its totient is φ = 3951285420.

The previous prime is 3951285383. The next prime is 3951285433. The reversal of 3951285421 is 1245821593.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2238236100 + 1713049321 = 47310^2 + 41389^2 .

It is a cyclic number.

It is not a de Polignac number, because 3951285421 - 2²⁷ = 3817067693 is a prime.

It is a super-2 number, since 2×3951285421² = 31225312956414294482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3951285721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1975642710 + 1975642711.

It is an arithmetic number, because the mean of its divisors is an integer number (1975642711).

Almost surely, 2^3951285421 is an apocalyptic number.

It is an amenable number.

3951285421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3951285421 is an equidigital number, since it uses as much as digits as its factorization.

3951285421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 40.

The square root of 3951285421 is about 62859.2508784507. The cubic root of 3951285421 is about 1580.9305820962.

The spelling of 3951285421 in words is "three billion, nine hundred fifty-one million, two hundred eighty-five thousand, four hundred twenty-one".