9979901 has 4 divisors (see below), whose sum is σ = 10566972. Its totient is φ = 9392832.

The previous prime is 9979897. The next prime is 9979927. The reversal of 9979901 is 1099799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6255001 + 3724900 = 2501^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 9979901 - 2² = 9979897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979961) 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, 293510 + ... + 293543.

It is an arithmetic number, because the mean of its divisors is an integer number (2641743).

Almost surely, 2^9979901 is an apocalyptic number.

It is an amenable number.

9979901 is a deficient number, since it is larger than the sum of its proper divisors (587071).

9979901 is a wasteful number, since it uses less digits than its factorization.

9979901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587070.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 9979901 is about 3159.0981307962. The cubic root of 9979901 is about 215.2990322493.

The spelling of 9979901 in words is "nine million, nine hundred seventy-nine thousand, nine hundred one".