1225415138 has 4 divisors (see below), whose sum is σ = 1838122710. Its totient is φ = 612707568.

The previous prime is 1225415083. The next prime is 1225415141. The reversal of 1225415138 is 8315145221.

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

It can be written as a sum of positive squares in only one way, i.e., 844657969 + 380757169 = 29063^2 + 19513^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306353783 + ... + 306353786.

Almost surely, 2^1225415138 is an apocalyptic number.

1225415138 is a deficient number, since it is larger than the sum of its proper divisors (612707572).

1225415138 is an equidigital number, since it uses as much as digits as its factorization.

1225415138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612707571.

The product of its digits is 9600, while the sum is 32.

The square root of 1225415138 is about 35005.9300404946. The cubic root of 1225415138 is about 1070.1083356113.

The spelling of 1225415138 in words is "one billion, two hundred twenty-five million, four hundred fifteen thousand, one hundred thirty-eight".