61561323 has 16 divisors (see below), whose sum is σ = 91324800. Its totient is φ = 40985640.

The previous prime is 61561321. The next prime is 61561327. The reversal of 61561323 is 32316516.

It is not a de Polignac number, because 61561323 - 2¹ = 61561321 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 (61561321) 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 15 ways as a sum of consecutive naturals, for example, 33088 + ... + 34898.

It is an arithmetic number, because the mean of its divisors is an integer number (5707800).

Almost surely, 2^61561323 is an apocalyptic number.

61561323 is a deficient number, since it is larger than the sum of its proper divisors (29763477).

61561323 is a wasteful number, since it uses less digits than its factorization.

61561323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079 (or 3073 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 61561323 is about 7846.1024082024. The cubic root of 61561323 is about 394.8534905028.

Adding to 61561323 its reverse (32316516), we get a palindrome (93877839).

The spelling of 61561323 in words is "sixty-one million, five hundred sixty-one thousand, three hundred twenty-three".