101866001 has 4 divisors (see below), whose sum is σ = 102168612. Its totient is φ = 101563392.

The previous prime is 101865991. The next prime is 101866003. The reversal of 101866001 is 100668101.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19492225 + 82373776 = 4415^2 + 9076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101866001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101866003) 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, 150800 + ... + 151473.

It is an arithmetic number, because the mean of its divisors is an integer number (25542153).

Almost surely, 2^101866001 is an apocalyptic number.

It is an amenable number.

101866001 is a deficient number, since it is larger than the sum of its proper divisors (302611).

101866001 is an equidigital number, since it uses as much as digits as its factorization.

101866001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302610.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 101866001 is about 10092.8688191217. The cubic root of 101866001 is about 467.0281794550.

The spelling of 101866001 in words is "one hundred one million, eight hundred sixty-six thousand, one".