1561004016 has 80 divisors (see below), whose sum is σ = 4737613440. Its totient is φ = 436642560.

The previous prime is 1561004009. The next prime is 1561004023. The reversal of 1561004016 is 6104001651.

It is an interprime number because it is at equal distance from previous prime (1561004009) and next prime (1561004023).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 106846 + ... + 120573.

It is an arithmetic number, because the mean of its divisors is an integer number (59220168).

Almost surely, 2^1561004016 is an apocalyptic number.

1561004016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561004016 is an abundant number, since it is smaller than the sum of its proper divisors (3176609424).

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

1561004016 is a wasteful number, since it uses less digits than its factorization.

1561004016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227454 (or 227448 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1561004016 is about 39509.5433534735. The cubic root of 1561004016 is about 1160.0267572108.

Adding to 1561004016 its reverse (6104001651), we get a palindrome (7665005667).

The spelling of 1561004016 in words is "one billion, five hundred sixty-one million, four thousand, sixteen".