1542885121 has 4 divisors (see below), whose sum is σ = 1575712512. Its totient is φ = 1510057732.

The previous prime is 1542885061. The next prime is 1542885137. The reversal of 1542885121 is 1215882451.

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: 1215882451 = 7 ⋅173697493.

It is a cyclic number.

It is not a de Polignac number, because 1542885121 - 2²⁵ = 1509330689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1542885151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16413625 + ... + 16413718.

It is an arithmetic number, because the mean of its divisors is an integer number (393928128).

Almost surely, 2^1542885121 is an apocalyptic number.

It is an amenable number.

1542885121 is a deficient number, since it is larger than the sum of its proper divisors (32827391).

1542885121 is an equidigital number, since it uses as much as digits as its factorization.

1542885121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32827390.

The product of its digits is 25600, while the sum is 37.

The square root of 1542885121 is about 39279.5763851903. The cubic root of 1542885121 is about 1155.5210559805.

The spelling of 1542885121 in words is "one billion, five hundred forty-two million, eight hundred eighty-five thousand, one hundred twenty-one".