998552551 has 2 divisors, whose sum is σ = 998552552. Its totient is φ = 998552550.

The previous prime is 998552537. The next prime is 998552557. The reversal of 998552551 is 155255899.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998552551 - 2⁵ = 998552519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998552495 and 998552504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998552557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499276275 + 499276276.

It is an arithmetic number, because the mean of its divisors is an integer number (499276276).

Almost surely, 2^998552551 is an apocalyptic number.

998552551 is a deficient number, since it is larger than the sum of its proper divisors (1).

998552551 is an equidigital number, since it uses as much as digits as its factorization.

998552551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810000, while the sum is 49.

The square root of 998552551 is about 31599.8821358561. The cubic root of 998552551 is about 999.5172840228.

The spelling of 998552551 in words is "nine hundred ninety-eight million, five hundred fifty-two thousand, five hundred fifty-one".