3151821349 has 2 divisors, whose sum is σ = 3151821350. Its totient is φ = 3151821348.

The previous prime is 3151821341. The next prime is 3151821371. The reversal of 3151821349 is 9431281513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3145190724 + 6630625 = 56082^2 + 2575^2 .

It is a cyclic number.

It is not a de Polignac number, because 3151821349 - 2³ = 3151821341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3151821341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1575910674 + 1575910675.

It is an arithmetic number, because the mean of its divisors is an integer number (1575910675).

Almost surely, 2^3151821349 is an apocalyptic number.

It is an amenable number.

3151821349 is a deficient number, since it is larger than the sum of its proper divisors (1).

3151821349 is an equidigital number, since it uses as much as digits as its factorization.

3151821349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 3151821349 is about 56141.0843233367. The cubic root of 3151821349 is about 1466.1796846449.

The spelling of 3151821349 in words is "three billion, one hundred fifty-one million, eight hundred twenty-one thousand, three hundred forty-nine".