51001623 has 16 divisors (see below), whose sum is σ = 75778560. Its totient is φ = 33901848.

The previous prime is 51001619. The next prime is 51001729. The reversal of 51001623 is 32610015.

It is not a de Polignac number, because 51001623 - 2² = 51001619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51001596 and 51001605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51001123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7336 + ... + 12482.

It is an arithmetic number, because the mean of its divisors is an integer number (4736160).

Almost surely, 2^51001623 is an apocalyptic number.

51001623 is a deficient number, since it is larger than the sum of its proper divisors (24776937).

51001623 is a wasteful number, since it uses less digits than its factorization.

51001623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5523 (or 5517 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 51001623 is about 7141.5420603676. The cubic root of 51001623 is about 370.8469107290.

Adding to 51001623 its reverse (32610015), we get a palindrome (83611638).

The spelling of 51001623 in words is "fifty-one million, one thousand, six hundred twenty-three".