3157317421 has 2 divisors, whose sum is σ = 3157317422. Its totient is φ = 3157317420.

The previous prime is 3157317353. The next prime is 3157317473. The reversal of 3157317421 is 1247137513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3105275625 + 52041796 = 55725^2 + 7214^2 .

It is an emirp because it is prime and its reverse (1247137513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3157317421 - 2¹³ = 3157309229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3157317521) 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, 1578658710 + 1578658711.

It is an arithmetic number, because the mean of its divisors is an integer number (1578658711).

Almost surely, 2^3157317421 is an apocalyptic number.

It is an amenable number.

3157317421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3157317421 is an equidigital number, since it uses as much as digits as its factorization.

3157317421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 34.

The square root of 3157317421 is about 56190.0117547594. The cubic root of 3157317421 is about 1467.0314196509.

The spelling of 3157317421 in words is "three billion, one hundred fifty-seven million, three hundred seventeen thousand, four hundred twenty-one".