1242145522 has 4 divisors (see below), whose sum is σ = 1863218286. Its totient is φ = 621072760.

The previous prime is 1242145517. The next prime is 1242145549. The reversal of 1242145522 is 2255412421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2255412421 = 12923 ⋅174527.

It can be written as a sum of positive squares in only one way, i.e., 1169708401 + 72437121 = 34201^2 + 8511^2 .

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, 310536379 + ... + 310536382.

Almost surely, 2^1242145522 is an apocalyptic number.

1242145522 is a deficient number, since it is larger than the sum of its proper divisors (621072764).

1242145522 is an equidigital number, since it uses as much as digits as its factorization.

1242145522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621072763.

The product of its digits is 6400, while the sum is 28.

The square root of 1242145522 is about 35244.0849221540. The cubic root of 1242145522 is about 1074.9563413313.

Adding to 1242145522 its reverse (2255412421), we get a palindrome (3497557943).

The spelling of 1242145522 in words is "one billion, two hundred forty-two million, one hundred forty-five thousand, five hundred twenty-two".