1189901 has 2 divisors, whose sum is σ = 1189902. Its totient is φ = 1189900.

The previous prime is 1189897. The next prime is 1189907. The reversal of 1189901 is 1099811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 940900 + 249001 = 970^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1189901 - 2² = 1189897 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1189907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594950 + 594951.

It is an arithmetic number, because the mean of its divisors is an integer number (594951).

2^1189901 is an apocalyptic number.

It is an amenable number.

1189901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189901 is an equidigital number, since it uses as much as digits as its factorization.

1189901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1189901 is about 1090.8258339442. The cubic root of 1189901 is about 105.9669114713.

The spelling of 1189901 in words is "one million, one hundred eighty-nine thousand, nine hundred one".