1561375200 has 864 divisors, whose sum is σ = 6925056768. Its totient is φ = 301056000.

The previous prime is 1561375199. The next prime is 1561375213. The reversal of 1561375200 is 25731651.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 21991165 + ... + 21991235.

It is an arithmetic number, because the mean of its divisors is an integer number (8015112).

Almost surely, 2^1561375200 is an apocalyptic number.

1561375200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561375200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3462528384).

1561375200 is an abundant number, since it is smaller than the sum of its proper divisors (5363681568).

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

1561375200 is a wasteful number, since it uses less digits than its factorization.

1561375200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 1561375200 is about 39514.2404709998. The cubic root of 1561375200 is about 1160.1186957416.

The spelling of 1561375200 in words is "one billion, five hundred sixty-one million, three hundred seventy-five thousand, two hundred".