9801566 has 4 divisors (see below), whose sum is σ = 14702352. Its totient is φ = 4900782.

The previous prime is 9801563. The next prime is 9801569. The reversal of 9801566 is 6651089.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6651089 = 79 ⋅84191.

It is an interprime number because it is at equal distance from previous prime (9801563) and next prime (9801569).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9801563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2450390 + ... + 2450393.

It is an arithmetic number, because the mean of its divisors is an integer number (3675588).

Almost surely, 2^9801566 is an apocalyptic number.

9801566 is a deficient number, since it is larger than the sum of its proper divisors (4900786).

9801566 is a wasteful number, since it uses less digits than its factorization.

9801566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900785.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 9801566 is about 3130.7452786837. The cubic root of 9801566 is about 214.0088941481.

The spelling of 9801566 in words is "nine million, eight hundred one thousand, five hundred sixty-six".