51520194 has 48 divisors (see below), whose sum is σ = 122279040. Its totient is φ = 15547680.

The previous prime is 51520193. The next prime is 51520199. The reversal of 51520194 is 49102515.

51520194 is a `hidden beast` number, since 51 + 520 + 1 + 94 = 666.

It is not an unprimeable number, because it can be changed into a prime (51520193) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72312 + ... + 73020.

It is an arithmetic number, because the mean of its divisors is an integer number (2547480).

Almost surely, 2^51520194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51520194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61139520).

51520194 is an abundant number, since it is smaller than the sum of its proper divisors (70758846).

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

51520194 is a wasteful number, since it uses less digits than its factorization.

51520194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 51520194 is about 7177.7568919545. The cubic root of 51520194 is about 372.0995657873.

The spelling of 51520194 in words is "fifty-one million, five hundred twenty thousand, one hundred ninety-four".