1242145511 has 4 divisors (see below), whose sum is σ = 1315212912. Its totient is φ = 1169078112.

The previous prime is 1242145493. The next prime is 1242145517. The reversal of 1242145511 is 1155412421.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1242145511 - 2⁶ = 1242145447 is a prime.

It is a super-2 number, since 2×1242145511² = 3085850940994902242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242145517) 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, 36533675 + ... + 36533708.

It is an arithmetic number, because the mean of its divisors is an integer number (328803228).

Almost surely, 2^1242145511 is an apocalyptic number.

1242145511 is a deficient number, since it is larger than the sum of its proper divisors (73067401).

1242145511 is an equidigital number, since it uses as much as digits as its factorization.

1242145511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73067400.

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

The square root of 1242145511 is about 35244.0847660994. The cubic root of 1242145511 is about 1074.9563381582.

Adding to 1242145511 its reverse (1155412421), we get a palindrome (2397557932).

The spelling of 1242145511 in words is "one billion, two hundred forty-two million, one hundred forty-five thousand, five hundred eleven".