1187447461 has 4 divisors (see below), whose sum is σ = 1187593792. Its totient is φ = 1187301132.

The previous prime is 1187447441. The next prime is 1187447479. The reversal of 1187447461 is 1647447811.

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: 1647447811 = 7499 ⋅219689.

It is a cyclic number.

It is not a de Polignac number, because 1187447461 - 2¹³ = 1187439269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187447441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60231 + ... + 77476.

It is an arithmetic number, because the mean of its divisors is an integer number (296898448).

Almost surely, 2^1187447461 is an apocalyptic number.

It is an amenable number.

1187447461 is a deficient number, since it is larger than the sum of its proper divisors (146331).

1187447461 is an equidigital number, since it uses as much as digits as its factorization.

1187447461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146330.

The product of its digits is 150528, while the sum is 43.

The square root of 1187447461 is about 34459.3595558594. The cubic root of 1187447461 is about 1058.9402785748.

The spelling of 1187447461 in words is "one billion, one hundred eighty-seven million, four hundred forty-seven thousand, four hundred sixty-one".