1042606408561 has 3 divisors (see below), whose sum is σ = 1042607429643. Its totient is φ = 1042605387480.

The previous prime is 1042606408553. The next prime is 1042606408607. The reversal of 1042606408561 is 1658046062401.

The square root of 1042606408561 is 1021081.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 247086961 + 1042359321600 = 15719^2 + 1020960^2 .

It is not a de Polignac number, because 1042606408561 - 2³ = 1042606408553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1042606408511) 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 2 ways as a sum of consecutive naturals, for example, 510541 + ... + 1531621.

It is an arithmetic number, because the mean of its divisors is an integer number (347535809881).

Almost surely, 2^{1042606408561} is an apocalyptic number.

1042606408561 is the 1021081-st square number.

1042606408561 is the 510541-st centered octagonal number.

It is an amenable number.

1042606408561 is a deficient number, since it is larger than the sum of its proper divisors (1021082).

1042606408561 is an frugal number, since it uses more digits than its factorization.

1042606408561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042162 (or 1021081 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 1042606408561 in words is "one trillion, forty-two billion, six hundred six million, four hundred eight thousand, five hundred sixty-one".