1098649 has 2 divisors, whose sum is σ = 1098650. Its totient is φ = 1098648.

The previous prime is 1098631. The next prime is 1098667. The reversal of 1098649 is 9468901.

It is a balanced prime because it is at equal distance from previous prime (1098631) and next prime (1098667).

It can be written as a sum of positive squares in only one way, i.e., 912025 + 186624 = 955^2 + 432^2 .

It is a cyclic number.

It is not a de Polignac number, because 1098649 - 2¹³ = 1090457 is a prime.

It is a Chen prime.

1098649 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1098689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549324 + 549325.

It is an arithmetic number, because the mean of its divisors is an integer number (549325).

2^1098649 is an apocalyptic number.

It is an amenable number.

1098649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098649 is an equidigital number, since it uses as much as digits as its factorization.

1098649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1098649 is about 1048.1645863127. The cubic root of 1098649 is about 103.1857333102.

The spelling of 1098649 in words is "one million, ninety-eight thousand, six hundred forty-nine".