99990549 has 24 divisors (see below), whose sum is σ = 153653760. Its totient is φ = 62441088.

The previous prime is 99990547. The next prime is 99990551. The reversal of 99990549 is 94509999.

It is a happy number.

99990549 is a `hidden beast` number, since 9 + 9 + 9 + 90 + 549 = 666.

It is an interprime number because it is at equal distance from previous prime (99990547) and next prime (99990551).

It is not a de Polignac number, because 99990549 - 2¹ = 99990547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99990495 and 99990504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99990547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33292 + ... + 36170.

It is an arithmetic number, because the mean of its divisors is an integer number (6402240).

Almost surely, 2^99990549 is an apocalyptic number.

It is an amenable number.

99990549 is a deficient number, since it is larger than the sum of its proper divisors (53663211).

99990549 is a wasteful number, since it uses less digits than its factorization.

99990549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3129 (or 3126 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 54.

The square root of 99990549 is about 9999.5274388343. The cubic root of 99990549 is about 464.1442603486.

The spelling of 99990549 in words is "ninety-nine million, nine hundred ninety thousand, five hundred forty-nine".