51997653 has 8 divisors (see below), whose sum is σ = 77033600. Its totient is φ = 34665084.

The previous prime is 51997643. The next prime is 51997657. The reversal of 51997653 is 35679915.

It is not a de Polignac number, because 51997653 - 2⁴ = 51997637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51997599 and 51997608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51997657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 962893 + ... + 962946.

It is an arithmetic number, because the mean of its divisors is an integer number (9629200).

Almost surely, 2^51997653 is an apocalyptic number.

It is an amenable number.

51997653 is a deficient number, since it is larger than the sum of its proper divisors (25035947).

51997653 is a wasteful number, since it uses less digits than its factorization.

51997653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1925848 (or 1925842 counting only the distinct ones).

The product of its digits is 255150, while the sum is 45.

The square root of 51997653 is about 7210.9398139216. The cubic root of 51997653 is about 373.2455000821.

It can be divided in two parts, 51997 and 653, that added together give a triangular number (52650 = T₃₂₄).

The spelling of 51997653 in words is "fifty-one million, nine hundred ninety-seven thousand, six hundred fifty-three".