7123513 has 2 divisors, whose sum is σ = 7123514. Its totient is φ = 7123512.

The previous prime is 7123511. The next prime is 7123547. The reversal of 7123513 is 3153217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6953769 + 169744 = 2637^2 + 412^2 .

It is an emirp because it is prime and its reverse (3153217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7123513 - 2¹ = 7123511 is a prime.

It is a super-2 number, since 2×7123513² = 101488874922338, which contains 22 as substring.

Together with 7123511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7123511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3561756 + 3561757.

It is an arithmetic number, because the mean of its divisors is an integer number (3561757).

Almost surely, 2^7123513 is an apocalyptic number.

It is an amenable number.

7123513 is a deficient number, since it is larger than the sum of its proper divisors (1).

7123513 is an equidigital number, since it uses as much as digits as its factorization.

7123513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 22.

The square root of 7123513 is about 2668.9910078530. The cubic root of 7123513 is about 192.4116691502.

It can be divided in two parts, 712 and 3513, that added together give a square (4225 = 65²).

The spelling of 7123513 in words is "seven million, one hundred twenty-three thousand, five hundred thirteen".