51561354 has 64 divisors (see below), whose sum is σ = 118879488. Its totient is φ = 14784000.

The previous prime is 51561353. The next prime is 51561359. The reversal of 51561354 is 45316515.

It is not an unprimeable number, because it can be changed into a prime (51561353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73204 + ... + 73904.

It is an arithmetic number, because the mean of its divisors is an integer number (1857492).

Almost surely, 2^51561354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51561354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59439744).

51561354 is an abundant number, since it is smaller than the sum of its proper divisors (67318134).

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

51561354 is a wasteful number, since it uses less digits than its factorization.

51561354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783.

The product of its digits is 9000, while the sum is 30.

The square root of 51561354 is about 7180.6235105317. The cubic root of 51561354 is about 372.1986307697.

Adding to 51561354 its reverse (45316515), we get a palindrome (96877869).

It can be divided in two parts, 51561 and 354, that added together give a palindrome (51915).

The spelling of 51561354 in words is "fifty-one million, five hundred sixty-one thousand, three hundred fifty-four".