1572666121 has 4 divisors (see below), whose sum is σ = 1693640452. Its totient is φ = 1451691792.

The previous prime is 1572666089. The next prime is 1572666163. The reversal of 1572666121 is 1216662751.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 491242896 + 1081423225 = 22164^2 + 32885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1572666121 - 2⁵ = 1572666089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1572666421) 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, 60487146 + ... + 60487171.

It is an arithmetic number, because the mean of its divisors is an integer number (423410113).

Almost surely, 2^1572666121 is an apocalyptic number.

It is an amenable number.

1572666121 is a deficient number, since it is larger than the sum of its proper divisors (120974331).

1572666121 is a wasteful number, since it uses less digits than its factorization.

1572666121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120974330.

The product of its digits is 30240, while the sum is 37.

The square root of 1572666121 is about 39656.8546533887. The cubic root of 1572666121 is about 1162.9084075639.

The spelling of 1572666121 in words is "one billion, five hundred seventy-two million, six hundred sixty-six thousand, one hundred twenty-one".