51481155 has 16 divisors (see below), whose sum is σ = 89858304. Its totient is φ = 24960480.

The previous prime is 51481147. The next prime is 51481159. The reversal of 51481155 is 55118415.

It is not a de Polignac number, because 51481155 - 2³ = 51481147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51481159) 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, 155839 + ... + 156168.

It is an arithmetic number, because the mean of its divisors is an integer number (5616144).

Almost surely, 2^51481155 is an apocalyptic number.

51481155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51481155 is a deficient number, since it is larger than the sum of its proper divisors (38377149).

51481155 is a wasteful number, since it uses less digits than its factorization.

51481155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312026.

The product of its digits is 4000, while the sum is 30.

The square root of 51481155 is about 7175.0369337029. The cubic root of 51481155 is about 372.0055569178.

The spelling of 51481155 in words is "fifty-one million, four hundred eighty-one thousand, one hundred fifty-five".