109951721 has 4 divisors (see below), whose sum is σ = 119947344. Its totient is φ = 99956100.

The previous prime is 109951717. The next prime is 109951759. The reversal of 109951721 is 127159901.

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 109951721 - 2² = 109951717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109951771) 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, 4997795 + ... + 4997816.

It is an arithmetic number, because the mean of its divisors is an integer number (29986836).

Almost surely, 2^109951721 is an apocalyptic number.

109951721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

109951721 is a deficient number, since it is larger than the sum of its proper divisors (9995623).

109951721 is an equidigital number, since it uses as much as digits as its factorization.

109951721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9995622.

The product of its (nonzero) digits is 5670, while the sum is 35.

The square root of 109951721 is about 10485.7866180845. The cubic root of 109951721 is about 479.0718769759.

The spelling of 109951721 in words is "one hundred nine million, nine hundred fifty-one thousand, seven hundred twenty-one".