1218695045 has 4 divisors (see below), whose sum is σ = 1462434060. Its totient is φ = 974956032.

The previous prime is 1218695039. The next prime is 1218695047. The reversal of 1218695045 is 5405968121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 172948801 + 1045746244 = 13151^2 + 32338^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218695045 - 2²⁸ = 950259589 is a prime.

It is a super-2 number, since 2×1218695045² = 2970435225415104050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1218694993 and 1218695011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218695047) 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, 121869500 + ... + 121869509.

It is an arithmetic number, because the mean of its divisors is an integer number (365608515).

Almost surely, 2^1218695045 is an apocalyptic number.

It is an amenable number.

1218695045 is a deficient number, since it is larger than the sum of its proper divisors (243739015).

1218695045 is an equidigital number, since it uses as much as digits as its factorization.

1218695045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243739014.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 1218695045 is about 34909.8130186915. The cubic root of 1218695045 is about 1068.1486152117.

The spelling of 1218695045 in words is "one billion, two hundred eighteen million, six hundred ninety-five thousand, forty-five".