85721963 has 2 divisors, whose sum is σ = 85721964. Its totient is φ = 85721962.

The previous prime is 85721903. The next prime is 85721969. The reversal of 85721963 is 36912758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85721963 - 2⁶ = 85721899 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85721963.

It is not a weakly prime, because it can be changed into another prime (85721969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42860981 + 42860982.

It is an arithmetic number, because the mean of its divisors is an integer number (42860982).

Almost surely, 2^85721963 is an apocalyptic number.

85721963 is a deficient number, since it is larger than the sum of its proper divisors (1).

85721963 is an equidigital number, since it uses as much as digits as its factorization.

85721963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 85721963 is about 9258.6156092582. The cubic root of 85721963 is about 440.9243018073.

The spelling of 85721963 in words is "eighty-five million, seven hundred twenty-one thousand, nine hundred sixty-three".