51491485 has 4 divisors (see below), whose sum is σ = 61789788. Its totient is φ = 41193184.

The previous prime is 51491477. The next prime is 51491497. The reversal of 51491485 is 58419415.

51491485 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58419415 = 5 ⋅11683883.

It can be written as a sum of positive squares in 2 ways, for example, as 13410244 + 38081241 = 3662^2 + 6171^2 .

It is a cyclic number.

It is not a de Polignac number, because 51491485 - 2³ = 51491477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5149144 + ... + 5149153.

It is an arithmetic number, because the mean of its divisors is an integer number (15447447).

Almost surely, 2^51491485 is an apocalyptic number.

It is an amenable number.

51491485 is a deficient number, since it is larger than the sum of its proper divisors (10298303).

51491485 is a wasteful number, since it uses less digits than its factorization.

51491485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10298302.

The product of its digits is 28800, while the sum is 37.

The square root of 51491485 is about 7175.7567545173. The cubic root of 51491485 is about 372.0304369631.

It can be divided in two parts, 51 and 491485, that added together give a triangular number (491536 = T₉₉₁).

The spelling of 51491485 in words is "fifty-one million, four hundred ninety-one thousand, four hundred eighty-five".