1185279649 has 4 divisors (see below), whose sum is σ = 1212844336. Its totient is φ = 1157714964.

The previous prime is 1185279643. The next prime is 1185279659. The reversal of 1185279649 is 9469725811.

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 1185279649 - 2²³ = 1176891041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1185279596 and 1185279605.

It is not an unprimeable number, because it can be changed into a prime (1185279643) 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, 13782279 + ... + 13782364.

It is an arithmetic number, because the mean of its divisors is an integer number (303211084).

Almost surely, 2^1185279649 is an apocalyptic number.

It is an amenable number.

1185279649 is a deficient number, since it is larger than the sum of its proper divisors (27564687).

1185279649 is an equidigital number, since it uses as much as digits as its factorization.

1185279649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27564686.

The product of its digits is 1088640, while the sum is 52.

The square root of 1185279649 is about 34427.8905685492. The cubic root of 1185279649 is about 1058.2954832242.

The spelling of 1185279649 in words is "one billion, one hundred eighty-five million, two hundred seventy-nine thousand, six hundred forty-nine".