1389551 has 2 divisors, whose sum is σ = 1389552. Its totient is φ = 1389550.

The previous prime is 1389547. The next prime is 1389559. The reversal of 1389551 is 1559831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389551 - 2² = 1389547 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694775 + 694776.

It is an arithmetic number, because the mean of its divisors is an integer number (694776).

2^1389551 is an apocalyptic number.

1389551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389551 is an equidigital number, since it uses as much as digits as its factorization.

1389551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 32.

The square root of 1389551 is about 1178.7921784606. The cubic root of 1389551 is about 111.5898850902.

It can be divided in two parts, 13895 and 51, that multiplied together give a triangular number (708645 = T₁₁₉₀).

The spelling of 1389551 in words is "one million, three hundred eighty-nine thousand, five hundred fifty-one".