18601001 has 4 divisors (see below), whose sum is σ = 18616404. Its totient is φ = 18585600.

The previous prime is 18600979. The next prime is 18601013. The reversal of 18601001 is 10010681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10010681 = 23 ⋅435247.

It can be written as a sum of positive squares in 2 ways, for example, as 16410601 + 2190400 = 4051^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 18601001 - 2¹⁴ = 18584617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18601021) 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, 5720 + ... + 8361.

It is an arithmetic number, because the mean of its divisors is an integer number (4654101).

Almost surely, 2^18601001 is an apocalyptic number.

It is an amenable number.

18601001 is a deficient number, since it is larger than the sum of its proper divisors (15403).

18601001 is a wasteful number, since it uses less digits than its factorization.

18601001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15402.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 18601001 is about 4312.8877796669. The cubic root of 18601001 is about 264.9590585855.

Adding to 18601001 its reverse (10010681), we get a palindrome (28611682).

The spelling of 18601001 in words is "eighteen million, six hundred one thousand, one".