218195001 has 24 divisors (see below), whose sum is σ = 321481160. Its totient is φ = 142580736.

The previous prime is 218194973. The next prime is 218195023. The reversal of 218195001 is 100591812.

It can be written as a sum of positive squares in 4 ways, for example, as 27092025 + 191102976 = 5205^2 + 13824^2 .

It is not a de Polignac number, because 218195001 - 2⁹ = 218194489 is a prime.

It is a super-2 number, since 2×218195001² = 95218116922780002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218195501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94011 + ... + 96303.

Almost surely, 2^218195001 is an apocalyptic number.

It is an amenable number.

218195001 is a deficient number, since it is larger than the sum of its proper divisors (103286159).

218195001 is a wasteful number, since it uses less digits than its factorization.

218195001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505 (or 2502 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 218195001 is about 14771.4251512845. The cubic root of 218195001 is about 602.0255624661.

The spelling of 218195001 in words is "two hundred eighteen million, one hundred ninety-five thousand, one".