7815000001 has 2 divisors, whose sum is σ = 7815000002. Its totient is φ = 7815000000.

The previous prime is 7814999999. The next prime is 7815000031. The reversal of 7815000001 is 1000005187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7371939600 + 443060401 = 85860^2 + 21049^2 .

It is an emirp because it is prime and its reverse (1000005187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7815000001 - 2¹ = 7814999999 is a prime.

It is a super-2 number, since 2×7815000001² (a number of 21 digits) contains 22 as substring.

Together with 7814999999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7815000031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3907500000 + 3907500001.

It is an arithmetic number, because the mean of its divisors is an integer number (3907500001).

Almost surely, 2^7815000001 is an apocalyptic number.

It is an amenable number.

7815000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

7815000001 is an equidigital number, since it uses as much as digits as its factorization.

7815000001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 7815000001 is about 88402.4886584083. The cubic root of 7815000001 is about 1984.4629459461.

Adding to 7815000001 its reverse (1000005187), we get a palindrome (8815005188).

The spelling of 7815000001 in words is "seven billion, eight hundred fifteen million, one", and thus it is an aban number.