1193451661 has 4 divisors (see below), whose sum is σ = 1195199712. Its totient is φ = 1191703612.

The previous prime is 1193451599. The next prime is 1193451673. The reversal of 1193451661 is 1661543911.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1661543911 = 313 ⋅5308447.

It is a cyclic number.

It is not a de Polignac number, because 1193451661 - 2²⁷ = 1059233933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1193451661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1193451691) 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, 873001 + ... + 874366.

It is an arithmetic number, because the mean of its divisors is an integer number (298799928).

Almost surely, 2^1193451661 is an apocalyptic number.

It is an amenable number.

1193451661 is a deficient number, since it is larger than the sum of its proper divisors (1748051).

1193451661 is an equidigital number, since it uses as much as digits as its factorization.

1193451661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748050.

The product of its digits is 19440, while the sum is 37.

The square root of 1193451661 is about 34546.3697224470. The cubic root of 1193451661 is about 1060.7220845355.

The spelling of 1193451661 in words is "one billion, one hundred ninety-three million, four hundred fifty-one thousand, six hundred sixty-one".