7939549477 has 2 divisors, whose sum is σ = 7939549478. Its totient is φ = 7939549476.

The previous prime is 7939549459. The next prime is 7939549507. The reversal of 7939549477 is 7749459397.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7267392001 + 672157476 = 85249^2 + 25926^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7939549477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7939549447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969774738 + 3969774739.

It is an arithmetic number, because the mean of its divisors is an integer number (3969774739).

Almost surely, 2^7939549477 is an apocalyptic number.

It is an amenable number.

7939549477 is a deficient number, since it is larger than the sum of its proper divisors (1).

7939549477 is an equidigital number, since it uses as much as digits as its factorization.

7939549477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60011280, while the sum is 64.

The square root of 7939549477 is about 89104.1496059527. The cubic root of 7939549477 is about 1994.9497144588.

The spelling of 7939549477 in words is "seven billion, nine hundred thirty-nine million, five hundred forty-nine thousand, four hundred seventy-seven".