1075642121 has 4 divisors (see below), whose sum is σ = 1084111872. Its totient is φ = 1067172372.

The previous prime is 1075642109. The next prime is 1075642151. The reversal of 1075642121 is 1212465701.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1212465701 = 67 ⋅18096503.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1075642121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1075642151) 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, 4234685 + ... + 4234938.

It is an arithmetic number, because the mean of its divisors is an integer number (271027968).

Almost surely, 2^1075642121 is an apocalyptic number.

It is an amenable number.

1075642121 is a deficient number, since it is larger than the sum of its proper divisors (8469751).

1075642121 is an equidigital number, since it uses as much as digits as its factorization.

1075642121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8469750.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1075642121 is about 32796.9834131129. The cubic root of 1075642121 is about 1024.6037321278.

The spelling of 1075642121 in words is "one billion, seventy-five million, six hundred forty-two thousand, one hundred twenty-one".