1649868013 has 2 divisors, whose sum is σ = 1649868014. Its totient is φ = 1649868012.

The previous prime is 1649867981. The next prime is 1649868043. The reversal of 1649868013 is 3108689461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 866595844 + 783272169 = 29438^2 + 27987^2 .

It is an emirp because it is prime and its reverse (3108689461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1649868013 - 2⁵ = 1649867981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649868043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824934006 + 824934007.

It is an arithmetic number, because the mean of its divisors is an integer number (824934007).

Almost surely, 2^1649868013 is an apocalyptic number.

It is an amenable number.

1649868013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649868013 is an equidigital number, since it uses as much as digits as its factorization.

1649868013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1649868013 is about 40618.5673430268. The cubic root of 1649868013 is about 1181.6342416440.

The spelling of 1649868013 in words is "one billion, six hundred forty-nine million, eight hundred sixty-eight thousand, thirteen".