1100661491 has 4 divisors (see below), whose sum is σ = 1118705184. Its totient is φ = 1082617800.

The previous prime is 1100661473. The next prime is 1100661493. The reversal of 1100661491 is 1941660011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1941660011 = 619 ⋅3136769.

It is a cyclic number.

It is not a de Polignac number, because 1100661491 - 2²² = 1096467187 is a prime.

It is a super-3 number, since 3×1100661491³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1100661493) 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, 9021755 + ... + 9021876.

It is an arithmetic number, because the mean of its divisors is an integer number (279676296).

Almost surely, 2^1100661491 is an apocalyptic number.

1100661491 is a deficient number, since it is larger than the sum of its proper divisors (18043693).

1100661491 is an equidigital number, since it uses as much as digits as its factorization.

1100661491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18043692.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1100661491 is about 33176.2187568143. The cubic root of 1100661491 is about 1032.4869964183.

The spelling of 1100661491 in words is "one billion, one hundred million, six hundred sixty-one thousand, four hundred ninety-one".