51321004 has 24 divisors (see below), whose sum is σ = 107106048. Its totient is φ = 21038160.

The previous prime is 51320999. The next prime is 51321037. The reversal of 51321004 is 40012315.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39202 + ... + 40489.

It is an arithmetic number, because the mean of its divisors is an integer number (4462752).

Almost surely, 2^51321004 is an apocalyptic number.

It is an amenable number.

51321004 is an abundant number, since it is smaller than the sum of its proper divisors (55785044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51321004 is a wasteful number, since it uses less digits than its factorization.

51321004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79725 (or 79723 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51321004 is about 7163.8679496484. The cubic root of 51321004 is about 371.6194030090.

Adding to 51321004 its reverse (40012315), we get a palindrome (91333319).

The spelling of 51321004 in words is "fifty-one million, three hundred twenty-one thousand, four".