869974981 has 2 divisors, whose sum is σ = 869974982. Its totient is φ = 869974980.

The previous prime is 869974957. The next prime is 869974991. The reversal of 869974981 is 189479968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 845064900 + 24910081 = 29070^2 + 4991^2 .

It is a cyclic number.

It is not a de Polignac number, because 869974981 - 2¹⁹ = 869450693 is a prime.

It is a super-2 number, since 2×869974981² = 1513712935131900722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869974921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434987490 + 434987491.

It is an arithmetic number, because the mean of its divisors is an integer number (434987491).

Almost surely, 2^869974981 is an apocalyptic number.

It is an amenable number.

869974981 is a deficient number, since it is larger than the sum of its proper divisors (1).

869974981 is an equidigital number, since it uses as much as digits as its factorization.

869974981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 61.

The square root of 869974981 is about 29495.3382926862. The cubic root of 869974981 is about 954.6311198349.

The spelling of 869974981 in words is "eight hundred sixty-nine million, nine hundred seventy-four thousand, nine hundred eighty-one".