1561206000 has 80 divisors (see below), whose sum is σ = 5033347488. Its totient is φ = 416320000.

The previous prime is 1561205963. The next prime is 1561206011. The reversal of 1561206000 is 6021651.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 124101 + ... + 136100.

Almost surely, 2^1561206000 is an apocalyptic number.

1561206000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561206000 is an abundant number, since it is smaller than the sum of its proper divisors (3472141488).

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

1561206000 is a wasteful number, since it uses less digits than its factorization.

1561206000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260227 (or 260211 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1561206000 is about 39512.0994127115. The cubic root of 1561206000 is about 1160.0767884165.

Adding to 1561206000 its reverse (6021651), we get a palindrome (1567227651).

It can be divided in two parts, 15 and 61206000, that multiplied together give a square (918090000 = 30300²).

The spelling of 1561206000 in words is "one billion, five hundred sixty-one million, two hundred six thousand".