1098631 has 2 divisors, whose sum is σ = 1098632. Its totient is φ = 1098630.

The previous prime is 1098623. The next prime is 1098649. The reversal of 1098631 is 1368901.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1098631 - 2³ = 1098623 is a prime.

It is a super-2 number, since 2×1098631² = 2413980148322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1098631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1098731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549315 + 549316.

It is an arithmetic number, because the mean of its divisors is an integer number (549316).

2^1098631 is an apocalyptic number.

1098631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098631 is an equidigital number, since it uses as much as digits as its factorization.

1098631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1098631 is about 1048.1559998397. The cubic root of 1098631 is about 103.1851697837.

It can be divided in two parts, 10 and 98631, that multiplied together give a triangular number (986310 = T₁₄₀₄).

The spelling of 1098631 in words is "one million, ninety-eight thousand, six hundred thirty-one".