1098661154 has 4 divisors (see below), whose sum is σ = 1647991734. Its totient is φ = 549330576.

The previous prime is 1098661153. The next prime is 1098661219. The reversal of 1098661154 is 4511668901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1076824225 + 21836929 = 32815^2 + 4673^2 .

It is a super-2 number, since 2×1098661154² = 2414112662617223432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1098661153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274665287 + ... + 274665290.

Almost surely, 2^1098661154 is an apocalyptic number.

1098661154 is a deficient number, since it is larger than the sum of its proper divisors (549330580).

1098661154 is an equidigital number, since it uses as much as digits as its factorization.

1098661154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549330579.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 1098661154 is about 33146.0578953214. The cubic root of 1098661154 is about 1031.8611381226.

The spelling of 1098661154 in words is "one billion, ninety-eight million, six hundred sixty-one thousand, one hundred fifty-four".