1098135281 has 4 divisors (see below), whose sum is σ = 1162731492. Its totient is φ = 1033539072.

The previous prime is 1098135251. The next prime is 1098135301. The reversal of 1098135281 is 1825318901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1825318901 = 7 ⋅260759843.

It can be written as a sum of positive squares in 2 ways, for example, as 938870881 + 159264400 = 30641^2 + 12620^2 .

It is not a de Polignac number, because 1098135281 - 2²² = 1093940977 is a prime.

It is a super-2 number, since 2×1098135281² = 2411802190753897922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1098135211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32298080 + ... + 32298113.

It is an arithmetic number, because the mean of its divisors is an integer number (290682873).

Almost surely, 2^1098135281 is an apocalyptic number.

It is an amenable number.

1098135281 is a deficient number, since it is larger than the sum of its proper divisors (64596211).

1098135281 is an equidigital number, since it uses as much as digits as its factorization.

1098135281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64596210.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 1098135281 is about 33138.1242830671. The cubic root of 1098135281 is about 1031.6964787675.

The spelling of 1098135281 in words is "one billion, ninety-eight million, one hundred thirty-five thousand, two hundred eighty-one".