1245621145 has 4 divisors (see below), whose sum is σ = 1494745380. Its totient is φ = 996496912.

The previous prime is 1245621131. The next prime is 1245621149. The reversal of 1245621145 is 5411265421.

It is a happy number.

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 462293001 + 783328144 = 21501^2 + 27988^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245621145 - 2⁷ = 1245621017 is a prime.

It is a super-2 number, since 2×1245621145² = 3103144073742222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1245621149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124562110 + ... + 124562119.

It is an arithmetic number, because the mean of its divisors is an integer number (373686345).

Almost surely, 2^1245621145 is an apocalyptic number.

It is an amenable number.

1245621145 is a deficient number, since it is larger than the sum of its proper divisors (249124235).

1245621145 is an equidigital number, since it uses as much as digits as its factorization.

1245621145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249124234.

The product of its digits is 9600, while the sum is 31.

The square root of 1245621145 is about 35293.3583695290. The cubic root of 1245621145 is about 1075.9580124046.

Adding to 1245621145 its reverse (5411265421), we get a palindrome (6656886566).

The spelling of 1245621145 in words is "one billion, two hundred forty-five million, six hundred twenty-one thousand, one hundred forty-five".