1561403431094 has 16 divisors (see below), whose sum is σ = 2522320420032. Its totient is φ = 720632497728.

The previous prime is 1561403431079. The next prime is 1561403431097. The reversal of 1561403431094 is 4901343041651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561403431097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 668627 + ... + 1889409.

It is an arithmetic number, because the mean of its divisors is an integer number (157645026252).

Almost surely, 2^{1561403431094} is an apocalyptic number.

1561403431094 is a deficient number, since it is larger than the sum of its proper divisors (960916988938).

1561403431094 is a wasteful number, since it uses less digits than its factorization.

1561403431094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269991.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 1561403431094 in words is "one trillion, five hundred sixty-one billion, four hundred three million, four hundred thirty-one thousand, ninety-four".