1561421552 has 20 divisors (see below), whose sum is σ = 3082336200. Its totient is φ = 765979968.

The previous prime is 1561421551. The next prime is 1561421557. The reversal of 1561421552 is 2551241651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561421551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 919802 + ... + 921497.

It is an arithmetic number, because the mean of its divisors is an integer number (154116810).

Almost surely, 2^1561421552 is an apocalyptic number.

It is an amenable number.

1561421552 is a deficient number, since it is larger than the sum of its proper divisors (1520914648).

1561421552 is a wasteful number, since it uses less digits than its factorization.

1561421552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841360 (or 1841354 counting only the distinct ones).

The product of its digits is 12000, while the sum is 32.

The square root of 1561421552 is about 39514.8269893720. The cubic root of 1561421552 is about 1160.1301756408.

The spelling of 1561421552 in words is "one billion, five hundred sixty-one million, four hundred twenty-one thousand, five hundred fifty-two".