84979969 has 2 divisors, whose sum is σ = 84979970. Its totient is φ = 84979968.

The previous prime is 84979949. The next prime is 84979981. The reversal of 84979969 is 96997948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84860944 + 119025 = 9212^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 84979969 - 2¹⁹ = 84455681 is a prime.

It is a super-2 number, since 2×84979969² = 14443190262481922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84979949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42489984 + 42489985.

It is an arithmetic number, because the mean of its divisors is an integer number (42489985).

Almost surely, 2^84979969 is an apocalyptic number.

It is an amenable number.

84979969 is a deficient number, since it is larger than the sum of its proper divisors (1).

84979969 is an equidigital number, since it uses as much as digits as its factorization.

84979969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 61.

The square root of 84979969 is about 9218.4580597842. The cubic root of 84979969 is about 439.6484261121.

The spelling of 84979969 in words is "eighty-four million, nine hundred seventy-nine thousand, nine hundred sixty-nine".