990541 has 4 divisors (see below), whose sum is σ = 1033632. Its totient is φ = 947452.

The previous prime is 990529. The next prime is 990547. The reversal of 990541 is 145099.

990541 = T₄₄ + T₄₅ + ... + T₁₈₁.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 145099 = 41 ⋅3539.

It is a cyclic number.

It is not a de Polignac number, because 990541 - 2¹⁵ = 957773 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21511 + ... + 21556.

It is an arithmetic number, because the mean of its divisors is an integer number (258408).

2⁹⁹⁰⁵⁴¹ is an apocalyptic number.

It is an amenable number.

990541 is a deficient number, since it is larger than the sum of its proper divisors (43091).

990541 is a wasteful number, since it uses less digits than its factorization.

990541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43090.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 990541 is about 995.2592627049. The cubic root of 990541 is about 99.6837006017.

The spelling of 990541 in words is "nine hundred ninety thousand, five hundred forty-one".