1561541615241 has 16 divisors (see below), whose sum is σ = 2093201448960. Its totient is φ = 1035456040080.

The previous prime is 1561541615209. The next prime is 1561541615269. The reversal of 1561541615241 is 1425161451651.

It is a happy number.

It is not a de Polignac number, because 1561541615241 - 2⁵ = 1561541615209 is a prime.

It is a super-2 number, since 2×1561541615241² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1561541615193 and 1561541615202.

It is not an unprimeable number, because it can be changed into a prime (1561541615201) 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 15 ways as a sum of consecutive naturals, for example, 4875156 + ... + 5185578.

It is an arithmetic number, because the mean of its divisors is an integer number (130825090560).

Almost surely, 2^{1561541615241} is an apocalyptic number.

It is an amenable number.

1561541615241 is a deficient number, since it is larger than the sum of its proper divisors (531659833719).

1561541615241 is a wasteful number, since it uses less digits than its factorization.

1561541615241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319396.

The product of its digits is 144000, while the sum is 42.

The spelling of 1561541615241 in words is "one trillion, five hundred sixty-one billion, five hundred forty-one million, six hundred fifteen thousand, two hundred forty-one".