1561141323 has 48 divisors (see below), whose sum is σ = 2697039360. Its totient is φ = 889881552.

The previous prime is 1561141291. The next prime is 1561141349. The reversal of 1561141323 is 3231411651.

It is a happy number.

1561141323 is a `hidden beast` number, since 1 + 5 + 611 + 41 + 3 + 2 + 3 = 666.

It is not a de Polignac number, because 1561141323 - 2⁵ = 1561141291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1561141223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 643090 + ... + 645512.

It is an arithmetic number, because the mean of its divisors is an integer number (56188320).

Almost surely, 2^1561141323 is an apocalyptic number.

1561141323 is a deficient number, since it is larger than the sum of its proper divisors (1135898037).

1561141323 is a wasteful number, since it uses less digits than its factorization.

1561141323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2933 (or 2920 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1561141323 is about 39511.2809587338. The cubic root of 1561141323 is about 1160.0607684673.

Adding to 1561141323 its reverse (3231411651), we get a palindrome (4792552974).

It can be divided in two parts, 1561 and 141323, that added together give a square (142884 = 378²).

The spelling of 1561141323 in words is "one billion, five hundred sixty-one million, one hundred forty-one thousand, three hundred twenty-three".