1651645213 has 2 divisors, whose sum is σ = 1651645214. Its totient is φ = 1651645212.

The previous prime is 1651645199. The next prime is 1651645231. The reversal of 1651645213 is 3125461561.

Together with next prime (1651645231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1545905124 + 105740089 = 39318^2 + 10283^2 .

It is a cyclic number.

It is not a de Polignac number, because 1651645213 - 2¹⁷ = 1651514141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1651645913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 825822606 + 825822607.

It is an arithmetic number, because the mean of its divisors is an integer number (825822607).

Almost surely, 2^1651645213 is an apocalyptic number.

It is an amenable number.

1651645213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1651645213 is an equidigital number, since it uses as much as digits as its factorization.

1651645213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 1651645213 is about 40640.4381497050. The cubic root of 1651645213 is about 1182.0583658335.

The spelling of 1651645213 in words is "one billion, six hundred fifty-one million, six hundred forty-five thousand, two hundred thirteen".