99990551 has 2 divisors, whose sum is σ = 99990552. Its totient is φ = 99990550.

The previous prime is 99990547. The next prime is 99990571. The reversal of 99990551 is 15509999.

It is a weak prime.

It is an emirp because it is prime and its reverse (15509999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99990551 - 2² = 99990547 is a prime.

It is a super-2 number, since 2×99990551² = 19996220578567202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99990496 and 99990505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99990511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995275 + 49995276.

It is an arithmetic number, because the mean of its divisors is an integer number (49995276).

Almost surely, 2^99990551 is an apocalyptic number.

99990551 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990551 is an equidigital number, since it uses as much as digits as its factorization.

99990551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164025, while the sum is 47.

The square root of 99990551 is about 9999.5275388390. The cubic root of 99990551 is about 464.1442634432.

The spelling of 99990551 in words is "ninety-nine million, nine hundred ninety thousand, five hundred fifty-one".