109487721 has 16 divisors (see below), whose sum is σ = 167808384. Its totient is φ = 62200704.

The previous prime is 109487717. The next prime is 109487723. The reversal of 109487721 is 127784901.

It is not a de Polignac number, because 109487721 - 2² = 109487717 is a prime.

It is a super-2 number, since 2×109487721² = 23975122099547682, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 109487721.

It is not an unprimeable number, because it can be changed into a prime (109487723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11436 + ... + 18701.

It is an arithmetic number, because the mean of its divisors is an integer number (10488024).

Almost surely, 2^109487721 is an apocalyptic number.

It is an amenable number.

109487721 is a deficient number, since it is larger than the sum of its proper divisors (58320663).

109487721 is a wasteful number, since it uses less digits than its factorization.

109487721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30320.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 109487721 is about 10463.6380384644. The cubic root of 109487721 is about 478.3970269187.

The spelling of 109487721 in words is "one hundred nine million, four hundred eighty-seven thousand, seven hundred twenty-one".