990061 has 4 divisors (see below), whose sum is σ = 992124. Its totient is φ = 988000.

The previous prime is 990053. The next prime is 990137. The reversal of 990061 is 160099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 160099 = 37 ⋅4327.

It can be written as a sum of positive squares in 2 ways, for example, as 2025 + 988036 = 45^2 + 994^2 .

It is a cyclic number.

It is not a de Polignac number, because 990061 - 2³ = 990053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111 + ... + 1411.

It is an arithmetic number, because the mean of its divisors is an integer number (248031).

2⁹⁹⁰⁰⁶¹ is an apocalyptic number.

It is an amenable number.

990061 is a deficient number, since it is larger than the sum of its proper divisors (2063).

990061 is a wasteful number, since it uses less digits than its factorization.

990061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 990061 is about 995.0180902878. The cubic root of 990061 is about 99.6675963021.

The spelling of 990061 in words is "nine hundred ninety thousand, sixty-one".