1561682430 has 400 divisors, whose sum is σ = 5417313264. Its totient is φ = 320060160.

The previous prime is 1561682429. The next prime is 1561682449. The reversal of 1561682430 is 342861651.

It is a happy number.

1561682430 is a `hidden beast` number, since 1 + 5 + 616 + 8 + 2 + 4 + 30 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 199 ways as a sum of consecutive naturals, for example, 21392874 + ... + 21392946.

Almost surely, 2^1561682430 is an apocalyptic number.

1561682430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561682430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2708656632).

1561682430 is an abundant number, since it is smaller than the sum of its proper divisors (3855630834).

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

1561682430 is an equidigital number, since it uses as much as digits as its factorization.

1561682430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1561682430 is about 39518.1278655758. The cubic root of 1561682430 is about 1160.1947824912.

The spelling of 1561682430 in words is "one billion, five hundred sixty-one million, six hundred eighty-two thousand, four hundred thirty".