1245621136 has 20 divisors (see below), whose sum is σ = 2418686092. Its totient is φ = 621444096.

The previous prime is 1245621131. The next prime is 1245621149. The reversal of 1245621136 is 6311265421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 839840400 + 405780736 = 28980^2 + 20144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1245621098 and 1245621107.

It is not an unprimeable number, because it can be changed into a prime (1245621131) 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, 77865 + ... + 92488.

Almost surely, 2^1245621136 is an apocalyptic number.

1245621136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1245621136 is a deficient number, since it is larger than the sum of its proper divisors (1173064956).

1245621136 is a wasteful number, since it uses less digits than its factorization.

1245621136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170818 (or 170812 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 1245621136 is about 35293.3582420262. The cubic root of 1245621136 is about 1075.9580098132.

Adding to 1245621136 its reverse (6311265421), we get a palindrome (7556886557).

The spelling of 1245621136 in words is "one billion, two hundred forty-five million, six hundred twenty-one thousand, one hundred thirty-six".