1242151145 has 4 divisors (see below), whose sum is σ = 1490581380. Its totient is φ = 993720912.

The previous prime is 1242151139. The next prime is 1242151153. The reversal of 1242151145 is 5411512421.

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 329386201 + 912764944 = 18149^2 + 30212^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242151145 - 2⁶ = 1242151081 is a prime.

It is a super-2 number, since 2×1242151145² = 3085878934049622050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124215110 + ... + 124215119.

It is an arithmetic number, because the mean of its divisors is an integer number (372645345).

Almost surely, 2^1242151145 is an apocalyptic number.

It is an amenable number.

1242151145 is a deficient number, since it is larger than the sum of its proper divisors (248430235).

1242151145 is an equidigital number, since it uses as much as digits as its factorization.

1242151145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248430234.

The product of its digits is 1600, while the sum is 26.

The square root of 1242151145 is about 35244.1646943150. The cubic root of 1242151145 is about 1074.9579633824.

Adding to 1242151145 its reverse (5411512421), we get a palindrome (6653663566).

The spelling of 1242151145 in words is "one billion, two hundred forty-two million, one hundred fifty-one thousand, one hundred forty-five".