9721792901 has 4 divisors (see below), whose sum is σ = 9947881152. Its totient is φ = 9495704652.

The previous prime is 9721792891. The next prime is 9721792919. The reversal of 9721792901 is 1092971279.

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.

It is a cyclic number.

It is not a de Polignac number, because 9721792901 - 2⁶ = 9721792837 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 (9721792921) 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, 113044061 + ... + 113044146.

It is an arithmetic number, because the mean of its divisors is an integer number (2486970288).

Almost surely, 2^9721792901 is an apocalyptic number.

It is an amenable number.

9721792901 is a deficient number, since it is larger than the sum of its proper divisors (226088251).

9721792901 is a wasteful number, since it uses less digits than its factorization.

9721792901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226088250.

The product of its (nonzero) digits is 142884, while the sum is 47.

The square root of 9721792901 is about 98599.1526383467. The cubic root of 9721792901 is about 2134.2671918608.

The spelling of 9721792901 in words is "nine billion, seven hundred twenty-one million, seven hundred ninety-two thousand, nine hundred one".