7315813 has 2 divisors, whose sum is σ = 7315814. Its totient is φ = 7315812.

The previous prime is 7315811. The next prime is 7315829. The reversal of 7315813 is 3185137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7306209 + 9604 = 2703^2 + 98^2 .

It is a cyclic number.

It is not a de Polignac number, because 7315813 - 2¹ = 7315811 is a prime.

It is a super-2 number, since 2×7315813² = 107042239701938, which contains 22 as substring.

Together with 7315811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7315811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3657906 + 3657907.

It is an arithmetic number, because the mean of its divisors is an integer number (3657907).

Almost surely, 2^7315813 is an apocalyptic number.

It is an amenable number.

7315813 is a deficient number, since it is larger than the sum of its proper divisors (1).

7315813 is an equidigital number, since it uses as much as digits as its factorization.

7315813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 7315813 is about 2704.7759611472. The cubic root of 7315813 is about 194.1277102203.

It can be divided in two parts, 7315 and 813, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 7315813 in words is "seven million, three hundred fifteen thousand, eight hundred thirteen".