1561196404 has 24 divisors (see below), whose sum is σ = 2789075520. Its totient is φ = 764419584.

The previous prime is 1561196393. The next prime is 1561196419. The reversal of 1561196404 is 4046911651.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 49492 + ... + 74644.

It is an arithmetic number, because the mean of its divisors is an integer number (116211480).

Almost surely, 2^1561196404 is an apocalyptic number.

It is an amenable number.

1561196404 is a deficient number, since it is larger than the sum of its proper divisors (1227879116).

1561196404 is a wasteful number, since it uses less digits than its factorization.

1561196404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25479 (or 25477 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1561196404 is about 39511.9779813666. The cubic root of 1561196404 is about 1160.0744115959.

The spelling of 1561196404 in words is "one billion, five hundred sixty-one million, one hundred ninety-six thousand, four hundred four".