8316550981 has 2 divisors, whose sum is σ = 8316550982. Its totient is φ = 8316550980.

The previous prime is 8316550873. The next prime is 8316550993. The reversal of 8316550981 is 1890556138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7567434081 + 749116900 = 86991^2 + 27370^2 .

It is a cyclic number.

It is not a de Polignac number, because 8316550981 - 2⁹ = 8316550469 is a prime.

It is a super-2 number, since 2×8316550981² (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 (8316550481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4158275490 + 4158275491.

It is an arithmetic number, because the mean of its divisors is an integer number (4158275491).

Almost surely, 2^8316550981 is an apocalyptic number.

It is an amenable number.

8316550981 is a deficient number, since it is larger than the sum of its proper divisors (1).

8316550981 is an equidigital number, since it uses as much as digits as its factorization.

8316550981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 8316550981 is about 91195.1258620766. The cubic root of 8316550981 is about 2026.0387684570.

The spelling of 8316550981 in words is "eight billion, three hundred sixteen million, five hundred fifty thousand, nine hundred eighty-one".