1561363400 has 48 divisors (see below), whose sum is σ = 3658813440. Its totient is φ = 619617600.

The previous prime is 1561363387. The next prime is 1561363417. The reversal of 1561363400 is 43631651.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5336 + ... + 56135.

It is an arithmetic number, because the mean of its divisors is an integer number (76225280).

Almost surely, 2^1561363400 is an apocalyptic number.

1561363400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561363400 is an abundant number, since it is smaller than the sum of its proper divisors (2097450040).

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

1561363400 is a wasteful number, since it uses less digits than its factorization.

1561363400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61614 (or 61605 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1561363400 is about 39514.0911574593. The cubic root of 1561363400 is about 1160.1157732250.

The spelling of 1561363400 in words is "one billion, five hundred sixty-one million, three hundred sixty-three thousand, four hundred".