9555551 has 2 divisors, whose sum is σ = 9555552. Its totient is φ = 9555550.

The previous prime is 9555527. The next prime is 9555569. The reversal of 9555551 is 1555559.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9555551 - 2⁶ = 9555487 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9555521) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4777775 + 4777776.

It is an arithmetic number, because the mean of its divisors is an integer number (4777776).

Almost surely, 2^9555551 is an apocalyptic number.

9555551 is a deficient number, since it is larger than the sum of its proper divisors (1).

9555551 is an equidigital number, since it uses as much as digits as its factorization.

9555551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28125, while the sum is 35.

The square root of 9555551 is about 3091.2054283079. The cubic root of 9555551 is about 212.2031916250.

The spelling of 9555551 in words is "nine million, five hundred fifty-five thousand, five hundred fifty-one".