107721997 has 4 divisors (see below), whose sum is σ = 109329856. Its totient is φ = 106114140.

The previous prime is 107721961. The next prime is 107722019. The reversal of 107721997 is 799127701.

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 107721997 - 2¹⁹ = 107197709 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 (107721937) 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, 803829 + ... + 803962.

It is an arithmetic number, because the mean of its divisors is an integer number (27332464).

Almost surely, 2^107721997 is an apocalyptic number.

It is an amenable number.

107721997 is a deficient number, since it is larger than the sum of its proper divisors (1607859).

107721997 is an equidigital number, since it uses as much as digits as its factorization.

107721997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607858.

The product of its (nonzero) digits is 55566, while the sum is 43.

The square root of 107721997 is about 10378.9208013165. The cubic root of 107721997 is about 475.8113512855.

It can be divided in two parts, 10772 and 1997, that added together give a square (12769 = 113²).

The spelling of 107721997 in words is "one hundred seven million, seven hundred twenty-one thousand, nine hundred ninety-seven".