8521379077 has 2 divisors, whose sum is σ = 8521379078. Its totient is φ = 8521379076.

The previous prime is 8521379063. The next prime is 8521379143. The reversal of 8521379077 is 7709731258.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7567434081 + 953944996 = 86991^2 + 30886^2 .

It is a cyclic number.

It is not a de Polignac number, because 8521379077 - 2⁷ = 8521378949 is a prime.

It is a super-2 number, since 2×8521379077² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8521379077.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8521329077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260689538 + 4260689539.

It is an arithmetic number, because the mean of its divisors is an integer number (4260689539).

Almost surely, 2^8521379077 is an apocalyptic number.

It is an amenable number.

8521379077 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521379077 is an equidigital number, since it uses as much as digits as its factorization.

8521379077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 740880, while the sum is 49.

The square root of 8521379077 is about 92311.3160831325. The cubic root of 8521379077 is about 2042.5371384236.

The spelling of 8521379077 in words is "eight billion, five hundred twenty-one million, three hundred seventy-nine thousand, seventy-seven".