3126651421 has 2 divisors, whose sum is σ = 3126651422. Its totient is φ = 3126651420.

The previous prime is 3126651403. The next prime is 3126651427. The reversal of 3126651421 is 1241566213.

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., 3120451321 + 6200100 = 55861^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 3126651421 - 2⁹ = 3126650909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3126651427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1563325710 + 1563325711.

It is an arithmetic number, because the mean of its divisors is an integer number (1563325711).

Almost surely, 2^3126651421 is an apocalyptic number.

It is an amenable number.

3126651421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3126651421 is an equidigital number, since it uses as much as digits as its factorization.

3126651421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 3126651421 is about 55916.4682450528. The cubic root of 3126651421 is about 1462.2663589170.

The spelling of 3126651421 in words is "three billion, one hundred twenty-six million, six hundred fifty-one thousand, four hundred twenty-one".