51170004 has 18 divisors (see below), whose sum is σ = 129346490. Its totient is φ = 17056656.

The previous prime is 51170003. The next prime is 51170023. The reversal of 51170004 is 40007115.

It can be written as a sum of positive squares in only one way, i.e., 42771600 + 8398404 = 6540^2 + 2898^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51170003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 710659 + ... + 710730.

Almost surely, 2^51170004 is an apocalyptic number.

It is an amenable number.

51170004 is an abundant number, since it is smaller than the sum of its proper divisors (78176486).

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

51170004 is a wasteful number, since it uses less digits than its factorization.

51170004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421399 (or 1421394 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 51170004 is about 7153.3211866936. The cubic root of 51170004 is about 371.2545773676.

Adding to 51170004 its reverse (40007115), we get a palindrome (91177119).

The spelling of 51170004 in words is "fifty-one million, one hundred seventy thousand, four".