1561143741 has 8 divisors (see below), whose sum is σ = 2081819520. Its totient is φ = 1040615232.

The previous prime is 1561143739. The next prime is 1561143761. The reversal of 1561143741 is 1473411651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561143741 - 2¹ = 1561143739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561143761) 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 7 ways as a sum of consecutive naturals, for example, 9100 + ... + 56613.

It is an arithmetic number, because the mean of its divisors is an integer number (260227440).

Almost surely, 2^1561143741 is an apocalyptic number.

It is an amenable number.

1561143741 is a deficient number, since it is larger than the sum of its proper divisors (520675779).

1561143741 is an equidigital number, since it uses as much as digits as its factorization.

1561143741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73635.

The product of its digits is 10080, while the sum is 33.

The square root of 1561143741 is about 39511.3115575780. The cubic root of 1561143741 is about 1160.0613673935.

The spelling of 1561143741 in words is "one billion, five hundred sixty-one million, one hundred forty-three thousand, seven hundred forty-one".