51397623 has 6 divisors (see below), whose sum is σ = 74241024. Its totient is φ = 34265076.

The previous prime is 51397609. The next prime is 51397631. The reversal of 51397623 is 32679315.

51397623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51397623 - 2⁴ = 51397607 is a prime.

It is a super-3 number, since 3×51397623³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51397693) 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 5 ways as a sum of consecutive naturals, for example, 2855415 + ... + 2855432.

It is an arithmetic number, because the mean of its divisors is an integer number (12373504).

Almost surely, 2^51397623 is an apocalyptic number.

51397623 is a deficient number, since it is larger than the sum of its proper divisors (22843401).

51397623 is a wasteful number, since it uses less digits than its factorization.

51397623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5710853 (or 5710850 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 51397623 is about 7169.2135551956. The cubic root of 51397623 is about 371.8042457767.

The spelling of 51397623 in words is "fifty-one million, three hundred ninety-seven thousand, six hundred twenty-three".