1098731 has 2 divisors, whose sum is σ = 1098732. Its totient is φ = 1098730.

The previous prime is 1098709. The next prime is 1098737. The reversal of 1098731 is 1378901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1098731 - 2⁶ = 1098667 is a prime.

It is a super-2 number, since 2×1098731² = 2414419620722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1098694 and 1098703.

It is not a weakly prime, because it can be changed into another prime (1098737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549365 + 549366.

It is an arithmetic number, because the mean of its divisors is an integer number (549366).

2^1098731 is an apocalyptic number.

1098731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1098731 is an equidigital number, since it uses as much as digits as its factorization.

1098731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 1098731 is about 1048.2037015771. The cubic root of 1098731 is about 103.1883004084.

The spelling of 1098731 in words is "one million, ninety-eight thousand, seven hundred thirty-one".