9721901 has 16 divisors (see below), whose sum is σ = 11880960. Its totient is φ = 7769520.

The previous prime is 9721897. The next prime is 9721919. The reversal of 9721901 is 1091279.

9721901 is nontrivially palindromic in base 6.

It is a cyclic number.

It is not a de Polignac number, because 9721901 - 2² = 9721897 is a prime.

It is an Ulam 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 (9721951) 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, 8366 + ... + 9456.

It is an arithmetic number, because the mean of its divisors is an integer number (742560).

Almost surely, 2^9721901 is an apocalyptic number.

9721901 is the 2546-th pentagonal number.

It is an amenable number.

9721901 is a deficient number, since it is larger than the sum of its proper divisors (2159059).

9721901 is a wasteful number, since it uses less digits than its factorization.

9721901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 9721901 is about 3117.9963117361. The cubic root of 9721901 is about 213.4275102312.

The spelling of 9721901 in words is "nine million, seven hundred twenty-one thousand, nine hundred one".