1661159 has 2 divisors, whose sum is σ = 1661160. Its totient is φ = 1661158.

The previous prime is 1661141. The next prime is 1661161. The reversal of 1661159 is 9511661.

It is a strong prime.

It is an emirp because it is prime and its reverse (9511661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1661159 - 2¹⁶ = 1595623 is a prime.

Together with 1661161, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830579 + 830580.

It is an arithmetic number, because the mean of its divisors is an integer number (830580).

2^1661159 is an apocalyptic number.

1661159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661159 is an equidigital number, since it uses as much as digits as its factorization.

1661159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 29.

The square root of 1661159 is about 1288.8595734214. The cubic root of 1661159 is about 118.4323648054.

The spelling of 1661159 in words is "one million, six hundred sixty-one thousand, one hundred fifty-nine".