97721747 has 4 divisors (see below), whose sum is σ = 97741800. Its totient is φ = 97701696.

The previous prime is 97721713. The next prime is 97721749. The reversal of 97721747 is 74712779.

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

It is a cyclic number.

It is not a de Polignac number, because 97721747 - 2⁶ = 97721683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97721698 and 97721707.

It is not an unprimeable number, because it can be changed into a prime (97721749) 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, 2504 + ... + 14202.

It is an arithmetic number, because the mean of its divisors is an integer number (24435450).

Almost surely, 2^97721747 is an apocalyptic number.

97721747 is a deficient number, since it is larger than the sum of its proper divisors (20053).

97721747 is a wasteful number, since it uses less digits than its factorization.

97721747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20052.

The product of its digits is 172872, while the sum is 44.

The square root of 97721747 is about 9885.4310477591. The cubic root of 97721747 is about 460.6068660071.

The spelling of 97721747 in words is "ninety-seven million, seven hundred twenty-one thousand, seven hundred forty-seven".