1188001 has 2 divisors, whose sum is σ = 1188002. Its totient is φ = 1188000.

The previous prime is 1187999. The next prime is 1188007. The reversal of 1188001 is 1008811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 731025 + 456976 = 855^2 + 676^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188001 - 2¹ = 1187999 is a prime.

It is a super-2 number, since 2×1188001² = 2822692752002, which contains 22 as substring.

Together with 1187999, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is equal to p₉₂₀₈₀ and since 1188001 and 92080 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1188001.

It is not a weakly prime, because it can be changed into another prime (1188007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594000 + 594001.

It is an arithmetic number, because the mean of its divisors is an integer number (594001).

2^1188001 is an apocalyptic number.

It is an amenable number.

1188001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188001 is an equidigital number, since it uses as much as digits as its factorization.

1188001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 1188001 is about 1089.9545862099. The cubic root of 1188001 is about 105.9104797765.

The spelling of 1188001 in words is "one million, one hundred eighty-eight thousand, one".