990500155 has 8 divisors (see below), whose sum is σ = 1258517952. Its totient is φ = 745788288.

The previous prime is 990500143. The next prime is 990500167. The reversal of 990500155 is 551005099.

It is an interprime number because it is at equal distance from previous prime (990500143) and next prime (990500167).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990500155 - 2¹¹ = 990498107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990500155.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 5826387 + ... + 5826556.

It is an arithmetic number, because the mean of its divisors is an integer number (157314744).

Almost surely, 2^990500155 is an apocalyptic number.

990500155 is a deficient number, since it is larger than the sum of its proper divisors (268017797).

990500155 is a wasteful number, since it uses less digits than its factorization.

990500155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11652965.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 990500155 is about 31472.2124262023. The cubic root of 990500155 is about 996.8233042901.

The spelling of 990500155 in words is "nine hundred ninety million, five hundred thousand, one hundred fifty-five".