990686481 has 16 divisors (see below), whose sum is σ = 1335605760. Its totient is φ = 653139200.

The previous prime is 990686479. The next prime is 990686483. The reversal of 990686481 is 184686099.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (990686479) and next prime (990686483).

It is a cyclic number.

It is not a de Polignac number, because 990686481 - 2¹ = 990686479 is a prime.

It is a super-2 number, since 2×990686481² = 1962919407272326722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990686483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159331 + ... + 165431.

It is an arithmetic number, because the mean of its divisors is an integer number (83475360).

Almost surely, 2^990686481 is an apocalyptic number.

It is an amenable number.

990686481 is a deficient number, since it is larger than the sum of its proper divisors (344919279).

990686481 is a wasteful number, since it uses less digits than its factorization.

990686481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696.

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 990686481 is about 31475.1724538564. The cubic root of 990686481 is about 996.8858055268.

The spelling of 990686481 in words is "nine hundred ninety million, six hundred eighty-six thousand, four hundred eighty-one".