7817388461 has 2 divisors, whose sum is σ = 7817388462. Its totient is φ = 7817388460.

The previous prime is 7817388361. The next prime is 7817388479. The reversal of 7817388461 is 1648837187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6989963236 + 827425225 = 83606^2 + 28765^2 .

It is a cyclic number.

It is not a de Polignac number, because 7817388461 - 2¹⁴ = 7817372077 is a prime.

It is a super-2 number, since 2×7817388461² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7817388361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3908694230 + 3908694231.

It is an arithmetic number, because the mean of its divisors is an integer number (3908694231).

Almost surely, 2^7817388461 is an apocalyptic number.

It is an amenable number.

7817388461 is a deficient number, since it is larger than the sum of its proper divisors (1).

7817388461 is an equidigital number, since it uses as much as digits as its factorization.

7817388461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1806336, while the sum is 53.

The square root of 7817388461 is about 88415.9966352243. The cubic root of 7817388461 is about 1984.6650925693.

The spelling of 7817388461 in words is "seven billion, eight hundred seventeen million, three hundred eighty-eight thousand, four hundred sixty-one".