8121252389 has 2 divisors, whose sum is σ = 8121252390. Its totient is φ = 8121252388.

The previous prime is 8121252379. The next prime is 8121252397. The reversal of 8121252389 is 9832521218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4819830625 + 3301421764 = 69425^2 + 57458^2 .

It is a cyclic number.

It is not a de Polignac number, because 8121252389 - 2³² = 3826285093 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121252379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060626194 + 4060626195.

It is an arithmetic number, because the mean of its divisors is an integer number (4060626195).

Almost surely, 2^8121252389 is an apocalyptic number.

It is an amenable number.

8121252389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121252389 is an equidigital number, since it uses as much as digits as its factorization.

8121252389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 8121252389 is about 90117.9914833880. The cubic root of 8121252389 is about 2010.0537421998.

The spelling of 8121252389 in words is "eight billion, one hundred twenty-one million, two hundred fifty-two thousand, three hundred eighty-nine".