4061520031561 has 4 divisors (see below), whose sum is σ = 4300432974612. Its totient is φ = 3822607088512.

The previous prime is 4061520031487. The next prime is 4061520031579. The reversal of 4061520031561 is 1651300251604.

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 1102827624336 + 2958692407225 = 1050156^2 + 1720085^2 .

It is a cyclic number.

It is not a de Polignac number, because 4061520031561 - 2¹¹ = 4061520029513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4061520031061) 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, 119456471500 + ... + 119456471533.

It is an arithmetic number, because the mean of its divisors is an integer number (1075108243653).

Almost surely, 2^{4061520031561} is an apocalyptic number.

It is an amenable number.

4061520031561 is a deficient number, since it is larger than the sum of its proper divisors (238912943051).

4061520031561 is a wasteful number, since it uses less digits than its factorization.

4061520031561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238912943050.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 4061520031561 in words is "four trillion, sixty-one billion, five hundred twenty million, thirty-one thousand, five hundred sixty-one".