1561033734 has 48 divisors (see below), whose sum is σ = 3391642944. Its totient is φ = 478764000.

The previous prime is 1561033703. The next prime is 1561033753. The reversal of 1561033734 is 4373301651.

It is a junction number, because it is equal to n+sod(n) for n = 1561033695 and 1561033704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333309 + ... + 337959.

It is an arithmetic number, because the mean of its divisors is an integer number (70659228).

Almost surely, 2^1561033734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561033734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1695821472).

1561033734 is an abundant number, since it is smaller than the sum of its proper divisors (1830609210).

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

1561033734 is a wasteful number, since it uses less digits than its factorization.

1561033734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5013 (or 5000 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 33.

The square root of 1561033734 is about 39509.9194380348. The cubic root of 1561033734 is about 1160.0341185962.

The spelling of 1561033734 in words is "one billion, five hundred sixty-one million, thirty-three thousand, seven hundred thirty-four".