51513273 has 32 divisors (see below), whose sum is σ = 87736320. Its totient is φ = 29261520.

The previous prime is 51513263. The next prime is 51513283. The reversal of 51513273 is 37231515.

It is an interprime number because it is at equal distance from previous prime (51513263) and next prime (51513283).

It is not a de Polignac number, because 51513273 - 2⁴ = 51513257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51513263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35386 + ... + 36812.

It is an arithmetic number, because the mean of its divisors is an integer number (2741760).

Almost surely, 2^51513273 is an apocalyptic number.

It is an amenable number.

51513273 is a deficient number, since it is larger than the sum of its proper divisors (36223047).

51513273 is a wasteful number, since it uses less digits than its factorization.

51513273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1628 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 51513273 is about 7177.2747613562. The cubic root of 51513273 is about 372.0829029591.

Adding to 51513273 its reverse (37231515), we get a palindrome (88744788).

The spelling of 51513273 in words is "fifty-one million, five hundred thirteen thousand, two hundred seventy-three".