107731721 has 4 divisors (see below), whose sum is σ = 109207572. Its totient is φ = 106255872.

The previous prime is 107731709. The next prime is 107731733. The reversal of 107731721 is 127137701.

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

It is an interprime number because it is at equal distance from previous prime (107731709) and next prime (107731733).

It can be written as a sum of positive squares in 2 ways, for example, as 66912400 + 40819321 = 8180^2 + 6389^2 .

It is a cyclic number.

It is not a de Polignac number, because 107731721 - 2¹⁴ = 107715337 is a prime.

It is a super-2 number, since 2×107731721² = 23212247419243682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (107731021) 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, 737816 + ... + 737961.

It is an arithmetic number, because the mean of its divisors is an integer number (27301893).

Almost surely, 2^107731721 is an apocalyptic number.

It is an amenable number.

107731721 is a deficient number, since it is larger than the sum of its proper divisors (1475851).

107731721 is an equidigital number, since it uses as much as digits as its factorization.

107731721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475850.

The product of its (nonzero) digits is 2058, while the sum is 29.

The square root of 107731721 is about 10379.3892402203. The cubic root of 107731721 is about 475.8256679230.

The spelling of 107731721 in words is "one hundred seven million, seven hundred thirty-one thousand, seven hundred twenty-one".