1142420561 has 4 divisors (see below), whose sum is σ = 1144428900. Its totient is φ = 1140412224.

The previous prime is 1142420527. The next prime is 1142420563. The reversal of 1142420561 is 1650242411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1650242411 = 17 ⋅97073083.

It can be written as a sum of positive squares in 2 ways, for example, as 578643025 + 563777536 = 24055^2 + 23744^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142420561 - 2⁶ = 1142420497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1142420561.

It is not an unprimeable number, because it can be changed into a prime (1142420563) 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, 1003316 + ... + 1004453.

It is an arithmetic number, because the mean of its divisors is an integer number (286107225).

Almost surely, 2^1142420561 is an apocalyptic number.

It is an amenable number.

1142420561 is a deficient number, since it is larger than the sum of its proper divisors (2008339).

1142420561 is an equidigital number, since it uses as much as digits as its factorization.

1142420561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008338.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1142420561 is about 33799.7124396052. The cubic root of 1142420561 is about 1045.3827679864.

Adding to 1142420561 its reverse (1650242411), we get a palindrome (2792662972).

The spelling of 1142420561 in words is "one billion, one hundred forty-two million, four hundred twenty thousand, five hundred sixty-one".