1212457145 has 8 divisors (see below), whose sum is σ = 1459598856. Its totient is φ = 966865536.

The previous prime is 1212457091. The next prime is 1212457157. The reversal of 1212457145 is 5417542121.

It can be written as a sum of positive squares in 4 ways, for example, as 71436304 + 1141020841 = 8452^2 + 33779^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212457145 - 2³⁰ = 138715321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385802 + ... + 388931.

It is an arithmetic number, because the mean of its divisors is an integer number (182449857).

Almost surely, 2^1212457145 is an apocalyptic number.

It is an amenable number.

1212457145 is a deficient number, since it is larger than the sum of its proper divisors (247141711).

1212457145 is an equidigital number, since it uses as much as digits as its factorization.

1212457145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775051.

The product of its digits is 11200, while the sum is 32.

The square root of 1212457145 is about 34820.3553255851. The cubic root of 1212457145 is about 1066.3230546323.

Adding to 1212457145 its reverse (5417542121), we get a palindrome (6629999266).

The spelling of 1212457145 in words is "one billion, two hundred twelve million, four hundred fifty-seven thousand, one hundred forty-five".