8621386973 has 2 divisors, whose sum is σ = 8621386974. Its totient is φ = 8621386972.

The previous prime is 8621386951. The next prime is 8621386979. The reversal of 8621386973 is 3796831268.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5177809849 + 3443577124 = 71957^2 + 58682^2 .

It is a cyclic number.

It is not a de Polignac number, because 8621386973 - 2¹⁸ = 8621124829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8621386979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4310693486 + 4310693487.

It is an arithmetic number, because the mean of its divisors is an integer number (4310693487).

Almost surely, 2^8621386973 is an apocalyptic number.

It is an amenable number.

8621386973 is a deficient number, since it is larger than the sum of its proper divisors (1).

8621386973 is an equidigital number, since it uses as much as digits as its factorization.

8621386973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The square root of 8621386973 is about 92851.4241840156. The cubic root of 8621386973 is about 2050.4965660459.

The spelling of 8621386973 in words is "eight billion, six hundred twenty-one million, three hundred eighty-six thousand, nine hundred seventy-three".