51391158 has 64 divisors (see below), whose sum is σ = 128658432. Its totient is φ = 13322880.

The previous prime is 51391139. The next prime is 51391199. The reversal of 51391158 is 85119315.

It is a super-2 number, since 2×51391158² = 5282102241161928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 32535 + ... + 34077.

It is an arithmetic number, because the mean of its divisors is an integer number (2010288).

Almost surely, 2^51391158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51391158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64329216).

51391158 is an abundant number, since it is smaller than the sum of its proper divisors (77267274).

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

51391158 is a wasteful number, since it uses less digits than its factorization.

51391158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629.

The product of its digits is 5400, while the sum is 33.

The square root of 51391158 is about 7168.7626547404. The cubic root of 51391158 is about 371.7886561113.

The spelling of 51391158 in words is "fifty-one million, three hundred ninety-one thousand, one hundred fifty-eight".