1142656121 has 2 divisors, whose sum is σ = 1142656122. Its totient is φ = 1142656120.

The previous prime is 1142656093. The next prime is 1142656129. The reversal of 1142656121 is 1216562411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 830073721 + 312582400 = 28811^2 + 17680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142656121 - 2¹⁸ = 1142393977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1142656129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571328060 + 571328061.

It is an arithmetic number, because the mean of its divisors is an integer number (571328061).

Almost surely, 2^1142656121 is an apocalyptic number.

It is an amenable number.

1142656121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1142656121 is an equidigital number, since it uses as much as digits as its factorization.

1142656121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 29.

The square root of 1142656121 is about 33803.1969050266. The cubic root of 1142656121 is about 1045.4546135192.

The spelling of 1142656121 in words is "one billion, one hundred forty-two million, six hundred fifty-six thousand, one hundred twenty-one".