1561400804 has 6 divisors (see below), whose sum is σ = 2732451414. Its totient is φ = 780700400.

The previous prime is 1561400801. The next prime is 1561400833. The reversal of 1561400804 is 4080041651.

It can be written as a sum of positive squares in only one way, i.e., 1493667904 + 67732900 = 38648^2 + 8230^2 .

It is not an unprimeable number, because it can be changed into a prime (1561400801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195175097 + ... + 195175104.

It is an arithmetic number, because the mean of its divisors is an integer number (455408569).

Almost surely, 2^1561400804 is an apocalyptic number.

It is an amenable number.

1561400804 is a deficient number, since it is larger than the sum of its proper divisors (1171050610).

1561400804 is a wasteful number, since it uses less digits than its factorization.

1561400804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390350205 (or 390350203 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 1561400804 is about 39514.5644541351. The cubic root of 1561400804 is about 1160.1250370568.

The spelling of 1561400804 in words is "one billion, five hundred sixty-one million, four hundred thousand, eight hundred four".