7847242477 has 2 divisors, whose sum is σ = 7847242478. Its totient is φ = 7847242476.

The previous prime is 7847242453. The next prime is 7847242523. The reversal of 7847242477 is 7742427487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6940389481 + 906852996 = 83309^2 + 30114^2 .

It is a cyclic number.

It is not a de Polignac number, because 7847242477 - 2⁷ = 7847242349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7847242577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3923621238 + 3923621239.

It is an arithmetic number, because the mean of its divisors is an integer number (3923621239).

Almost surely, 2^7847242477 is an apocalyptic number.

It is an amenable number.

7847242477 is a deficient number, since it is larger than the sum of its proper divisors (1).

7847242477 is an equidigital number, since it uses as much as digits as its factorization.

7847242477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4917248, while the sum is 52.

The square root of 7847242477 is about 88584.6627639345. The cubic root of 7847242477 is about 1987.1883119836.

The spelling of 7847242477 in words is "seven billion, eight hundred forty-seven million, two hundred forty-two thousand, four hundred seventy-seven".