1561451408 has 40 divisors (see below), whose sum is σ = 3414156480. Its totient is φ = 685274240.

The previous prime is 1561451401. The next prime is 1561451417. The reversal of 1561451408 is 8041541651.

It is not an unprimeable number, because it can be changed into a prime (1561451401) 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, 147860 + ... + 158067.

It is an arithmetic number, because the mean of its divisors is an integer number (85353912).

Almost surely, 2^1561451408 is an apocalyptic number.

It is an amenable number.

1561451408 is an abundant number, since it is smaller than the sum of its proper divisors (1852705072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561451408 is a wasteful number, since it uses less digits than its factorization.

1561451408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305975 (or 305969 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 1561451408 is about 39515.2047698098. The cubic root of 1561451408 is about 1160.1375698912.

The spelling of 1561451408 in words is "one billion, five hundred sixty-one million, four hundred fifty-one thousand, four hundred eight".