1561912424 has 8 divisors (see below), whose sum is σ = 2928585810. Its totient is φ = 780956208.

The previous prime is 1561912399. The next prime is 1561912427. The reversal of 1561912424 is 4242191651.

It can be written as a sum of positive squares in only one way, i.e., 1561672324 + 240100 = 39518^2 + 490^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1561912427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97619519 + ... + 97619534.

Almost surely, 2^1561912424 is an apocalyptic number.

It is an amenable number.

1561912424 is a deficient number, since it is larger than the sum of its proper divisors (1366673386).

1561912424 is a wasteful number, since it uses less digits than its factorization.

1561912424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195239059 (or 195239055 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 1561912424 is about 39521.0377394117. The cubic root of 1561912424 is about 1160.2517349026.

The spelling of 1561912424 in words is "one billion, five hundred sixty-one million, nine hundred twelve thousand, four hundred twenty-four".