1200561000 has 64 divisors (see below), whose sum is σ = 3745759680. Its totient is φ = 320148800.

The previous prime is 1200560983. The next prime is 1200561017. The reversal of 1200561000 is 1650021.

1200561000 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1200560983) and next prime (1200561017).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197094 + ... + 203093.

It is an arithmetic number, because the mean of its divisors is an integer number (58527495).

Almost surely, 2^1200561000 is an apocalyptic number.

1200561000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200561000 is an abundant number, since it is smaller than the sum of its proper divisors (2545198680).

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

1200561000 is a wasteful number, since it uses less digits than its factorization.

1200561000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400211 (or 400197 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1200561000 is about 34649.1125427478. The cubic root of 1200561000 is about 1062.8241410107.

The spelling of 1200561000 in words is "one billion, two hundred million, five hundred sixty-one thousand".