4542640121 has 4 divisors (see below), whose sum is σ = 4547338752. Its totient is φ = 4537941492.

The previous prime is 4542640097. The next prime is 4542640147. The reversal of 4542640121 is 1210462454.

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: 1210462454 = 2 ⋅605231227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4542640121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4542640181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2347865 + ... + 2349798.

It is an arithmetic number, because the mean of its divisors is an integer number (1136834688).

Almost surely, 2^4542640121 is an apocalyptic number.

It is an amenable number.

4542640121 is a deficient number, since it is larger than the sum of its proper divisors (4698631).

4542640121 is an equidigital number, since it uses as much as digits as its factorization.

4542640121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698630.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 4542640121 is about 67399.1106840439. The cubic root of 4542640121 is about 1656.1618540848.

The spelling of 4542640121 in words is "four billion, five hundred forty-two million, six hundred forty thousand, one hundred twenty-one".