7642813 has 2 divisors, whose sum is σ = 7642814. Its totient is φ = 7642812.

The previous prime is 7642787. The next prime is 7642829. The reversal of 7642813 is 3182467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7279204 + 363609 = 2698^2 + 603^2 .

It is an emirp because it is prime and its reverse (3182467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7642813 - 2⁵ = 7642781 is a prime.

7642813 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7642853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821406 + 3821407.

It is an arithmetic number, because the mean of its divisors is an integer number (3821407).

Almost surely, 2^7642813 is an apocalyptic number.

It is an amenable number.

7642813 is a deficient number, since it is larger than the sum of its proper divisors (1).

7642813 is an equidigital number, since it uses as much as digits as its factorization.

7642813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 7642813 is about 2764.5637992276. The cubic root of 7642813 is about 196.9780095185.

The spelling of 7642813 in words is "seven million, six hundred forty-two thousand, eight hundred thirteen".