1561049683 has 12 divisors (see below), whose sum is σ = 1622179848. Its totient is φ = 1501869600.

The previous prime is 1561049669. The next prime is 1561049723. The reversal of 1561049683 is 3869401651.

It is not a de Polignac number, because 1561049683 - 2¹³ = 1561041491 is a prime.

It is a super-2 number, since 2×1561049683² = 4873752225588800978, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561049653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117583 + ... + 130183.

It is an arithmetic number, because the mean of its divisors is an integer number (135181654).

Almost surely, 2^1561049683 is an apocalyptic number.

1561049683 is a deficient number, since it is larger than the sum of its proper divisors (61130165).

1561049683 is an equidigital number, since it uses as much as digits as its factorization.

1561049683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12754 (or 12711 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 1561049683 is about 39510.1212729093. The cubic root of 1561049683 is about 1160.0380692520.

The spelling of 1561049683 in words is "one billion, five hundred sixty-one million, forty-nine thousand, six hundred eighty-three".