18109701 has 6 divisors (see below), whose sum is σ = 26158470. Its totient is φ = 12073128.

The previous prime is 18109697. The next prime is 18109703. The reversal of 18109701 is 10790181.

It can be written as a sum of positive squares in only one way, i.e., 17388900 + 720801 = 4170^2 + 849^2 .

It is not a de Polignac number, because 18109701 - 2² = 18109697 is a prime.

It is a super-2 number, since 2×18109701² = 655922540618802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109703) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1006086 + ... + 1006103.

It is an arithmetic number, because the mean of its divisors is an integer number (4359745).

Almost surely, 2^18109701 is an apocalyptic number.

It is an amenable number.

18109701 is a deficient number, since it is larger than the sum of its proper divisors (8048769).

18109701 is a wasteful number, since it uses less digits than its factorization.

18109701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012195 (or 2012192 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 18109701 is about 4255.5494357368. The cubic root of 18109701 is about 262.6054651044.

Adding to 18109701 its reverse (10790181), we get a palindrome (28899882).

It can be divided in two parts, 1810 and 9701, that added together give a palindrome (11511).

The spelling of 18109701 in words is "eighteen million, one hundred nine thousand, seven hundred one".