51491158 has 16 divisors (see below), whose sum is σ = 80837856. Its totient is φ = 24552000.

The previous prime is 51491149. The next prime is 51491183. The reversal of 51491158 is 85119415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15658 + ... + 18658.

It is an arithmetic number, because the mean of its divisors is an integer number (5052366).

Almost surely, 2^51491158 is an apocalyptic number.

51491158 is a deficient number, since it is larger than the sum of its proper divisors (29346698).

51491158 is a wasteful number, since it uses less digits than its factorization.

51491158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3399.

The product of its digits is 7200, while the sum is 34.

The square root of 51491158 is about 7175.7339694278. The cubic root of 51491158 is about 372.0296494270.

The spelling of 51491158 in words is "fifty-one million, four hundred ninety-one thousand, one hundred fifty-eight".