51490273 has 4 divisors (see below), whose sum is σ = 52881940. Its totient is φ = 50098608.

The previous prime is 51490267. The next prime is 51490321. The reversal of 51490273 is 37209415.

51490273 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: 37209415 = 5 ⋅7441883.

It can be written as a sum of positive squares in 2 ways, for example, as 21372129 + 30118144 = 4623^2 + 5488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51490273 is a prime.

It is a super-2 number, since 2×51490273² = 5302496427229058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51490213) by changing a digit.

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, 695778 + ... + 695851.

It is an arithmetic number, because the mean of its divisors is an integer number (13220485).

Almost surely, 2^51490273 is an apocalyptic number.

It is an amenable number.

51490273 is a deficient number, since it is larger than the sum of its proper divisors (1391667).

51490273 is a wasteful number, since it uses less digits than its factorization.

51490273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391666.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 51490273 is about 7175.6723029971. The cubic root of 51490273 is about 372.0275180052.

Adding to 51490273 its reverse (37209415), we get a palindrome (88699688).

The spelling of 51490273 in words is "fifty-one million, four hundred ninety thousand, two hundred seventy-three".