1243012145 has 4 divisors (see below), whose sum is σ = 1491614580. Its totient is φ = 994409712.

The previous prime is 1243012117. The next prime is 1243012153. The reversal of 1243012145 is 5412103421.

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 879003904 + 364008241 = 29648^2 + 19079^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243012145 - 2⁶ = 1243012081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243012145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124301210 + ... + 124301219.

It is an arithmetic number, because the mean of its divisors is an integer number (372903645).

Almost surely, 2^1243012145 is an apocalyptic number.

It is an amenable number.

1243012145 is a deficient number, since it is larger than the sum of its proper divisors (248602435).

1243012145 is an equidigital number, since it uses as much as digits as its factorization.

1243012145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248602434.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1243012145 is about 35256.3773663716. The cubic root of 1243012145 is about 1075.2062759022.

Adding to 1243012145 its reverse (5412103421), we get a palindrome (6655115566).

The spelling of 1243012145 in words is "one billion, two hundred forty-three million, twelve thousand, one hundred forty-five".