85430977 has 2 divisors, whose sum is σ = 85430978. Its totient is φ = 85430976.

The previous prime is 85430941. The next prime is 85430999. The reversal of 85430977 is 77903458.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77862976 + 7568001 = 8824^2 + 2751^2 .

It is a cyclic number.

It is not a de Polignac number, because 85430977 - 2¹¹ = 85428929 is a prime.

It is not a weakly prime, because it can be changed into another prime (85430677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42715488 + 42715489.

It is an arithmetic number, because the mean of its divisors is an integer number (42715489).

Almost surely, 2^85430977 is an apocalyptic number.

It is an amenable number.

85430977 is a deficient number, since it is larger than the sum of its proper divisors (1).

85430977 is an equidigital number, since it uses as much as digits as its factorization.

85430977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 85430977 is about 9242.8879144995. The cubic root of 85430977 is about 440.4248255751.

The spelling of 85430977 in words is "eighty-five million, four hundred thirty thousand, nine hundred seventy-seven".