9870551 has 2 divisors, whose sum is σ = 9870552. Its totient is φ = 9870550.

The previous prime is 9870547. The next prime is 9870569. The reversal of 9870551 is 1550789.

It is a weak prime.

It is an emirp because it is prime and its reverse (1550789) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9870551 - 2² = 9870547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9870541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4935275 + 4935276.

It is an arithmetic number, because the mean of its divisors is an integer number (4935276).

Almost surely, 2^9870551 is an apocalyptic number.

9870551 is a deficient number, since it is larger than the sum of its proper divisors (1).

9870551 is an equidigital number, since it uses as much as digits as its factorization.

9870551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 9870551 is about 3141.7433058733. The cubic root of 9870551 is about 214.5097971882.

The spelling of 9870551 in words is "nine million, eight hundred seventy thousand, five hundred fifty-one".