1542689 has 2 divisors, whose sum is σ = 1542690. Its totient is φ = 1542688.

The previous prime is 1542661. The next prime is 1542691. The reversal of 1542689 is 9862451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1488400 + 54289 = 1220^2 + 233^2 .

It is an emirp because it is prime and its reverse (9862451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1542689 - 2⁸ = 1542433 is a prime.

Together with 1542691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1542089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771344 + 771345.

It is an arithmetic number, because the mean of its divisors is an integer number (771345).

2^1542689 is an apocalyptic number.

It is an amenable number.

1542689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1542689 is an equidigital number, since it uses as much as digits as its factorization.

1542689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 1542689 is about 1242.0503210418. The cubic root of 1542689 is about 115.5472093262.

The spelling of 1542689 in words is "one million, five hundred forty-two thousand, six hundred eighty-nine".