8979973621 has 2 divisors, whose sum is σ = 8979973622. Its totient is φ = 8979973620.

The previous prime is 8979973603. The next prime is 8979973727. The reversal of 8979973621 is 1263799798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6673092721 + 2306880900 = 81689^2 + 48030^2 .

It is a cyclic number.

It is not a de Polignac number, because 8979973621 - 2⁷ = 8979973493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8979973621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8979973921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4489986810 + 4489986811.

It is an arithmetic number, because the mean of its divisors is an integer number (4489986811).

Almost surely, 2^8979973621 is an apocalyptic number.

It is an amenable number.

8979973621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8979973621 is an equidigital number, since it uses as much as digits as its factorization.

8979973621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 61.

The square root of 8979973621 is about 94762.7227394823. The cubic root of 8979973621 is about 2078.5398422132.

The spelling of 8979973621 in words is "eight billion, nine hundred seventy-nine million, nine hundred seventy-three thousand, six hundred twenty-one".