985212551 has 2 divisors, whose sum is σ = 985212552. Its totient is φ = 985212550.

The previous prime is 985212511. The next prime is 985212559. The reversal of 985212551 is 155212589.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985212551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985212559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492606275 + 492606276.

It is an arithmetic number, because the mean of its divisors is an integer number (492606276).

Almost surely, 2^985212551 is an apocalyptic number.

985212551 is a deficient number, since it is larger than the sum of its proper divisors (1).

985212551 is an equidigital number, since it uses as much as digits as its factorization.

985212551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 38.

The square root of 985212551 is about 31388.0956892896. The cubic root of 985212551 is about 995.0463522256.

Adding to 985212551 its sum of digits (38), we get a palindrome (985212589).

The spelling of 985212551 in words is "nine hundred eighty-five million, two hundred twelve thousand, five hundred fifty-one".