51561411 has 16 divisors (see below), whose sum is σ = 75336960. Its totient is φ = 31108320.

The previous prime is 51561379. The next prime is 51561427. The reversal of 51561411 is 11416515.

It is not a de Polignac number, because 51561411 - 2⁵ = 51561379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51561431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4146 + ... + 10968.

It is an arithmetic number, because the mean of its divisors is an integer number (4708560).

Almost surely, 2^51561411 is an apocalyptic number.

51561411 is a deficient number, since it is larger than the sum of its proper divisors (23775549).

51561411 is a wasteful number, since it uses less digits than its factorization.

51561411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066.

The product of its digits is 600, while the sum is 24.

The square root of 51561411 is about 7180.6274795452. The cubic root of 51561411 is about 372.1987679222.

Adding to 51561411 its reverse (11416515), we get a palindrome (62977926).

Subtracting from 51561411 its reverse (11416515), we obtain a square (40144896 = 6336²).

The spelling of 51561411 in words is "fifty-one million, five hundred sixty-one thousand, four hundred eleven".