1098551641 has 4 divisors (see below), whose sum is σ = 1198419984. Its totient is φ = 998683300.

The previous prime is 1098551627. The next prime is 1098551683. The reversal of 1098551641 is 1461558901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1098551641 - 2⁵ = 1098551609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1098551594 and 1098551603.

It is not an unprimeable number, because it can be changed into a prime (1098551141) 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, 49934155 + ... + 49934176.

It is an arithmetic number, because the mean of its divisors is an integer number (299604996).

Almost surely, 2^1098551641 is an apocalyptic number.

1098551641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1098551641 is a deficient number, since it is larger than the sum of its proper divisors (99868343).

1098551641 is an equidigital number, since it uses as much as digits as its factorization.

1098551641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99868342.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 1098551641 is about 33144.4058779155. The cubic root of 1098551641 is about 1031.8268521606.

It can be divided in two parts, 10985 and 51641, that added together give a palindrome (62626).

The spelling of 1098551641 in words is "one billion, ninety-eight million, five hundred fifty-one thousand, six hundred forty-one".