8908904981 has 2 divisors, whose sum is σ = 8908904982. Its totient is φ = 8908904980.

The previous prime is 8908904959. The next prime is 8908904987. The reversal of 8908904981 is 1894098098.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6911261956 + 1997643025 = 83134^2 + 44695^2 .

It is a cyclic number.

It is not a de Polignac number, because 8908904981 - 2¹⁰ = 8908903957 is a prime.

It is a super-2 number, since 2×8908904981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8908904987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4454452490 + 4454452491.

It is an arithmetic number, because the mean of its divisors is an integer number (4454452491).

Almost surely, 2^8908904981 is an apocalyptic number.

It is an amenable number.

8908904981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8908904981 is an equidigital number, since it uses as much as digits as its factorization.

8908904981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 56.

The square root of 8908904981 is about 94386.9958256962. The cubic root of 8908904981 is about 2073.0420379736.

The spelling of 8908904981 in words is "eight billion, nine hundred eight million, nine hundred four thousand, nine hundred eighty-one".