990551455 has 4 divisors (see below), whose sum is σ = 1188661752. Its totient is φ = 792441160.

The previous prime is 990551449. The next prime is 990551509. The reversal of 990551455 is 554155099.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 990551455 - 2¹³ = 990543263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99055141 + ... + 99055150.

It is an arithmetic number, because the mean of its divisors is an integer number (297165438).

Almost surely, 2^990551455 is an apocalyptic number.

990551455 is a deficient number, since it is larger than the sum of its proper divisors (198110297).

990551455 is a wasteful number, since it uses less digits than its factorization.

990551455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198110296.

The product of its (nonzero) digits is 202500, while the sum is 43.

The square root of 990551455 is about 31473.0274203166. The cubic root of 990551455 is about 996.8405131559.

The spelling of 990551455 in words is "nine hundred ninety million, five hundred fifty-one thousand, four hundred fifty-five".