51378173 has 12 divisors (see below), whose sum is σ = 64542240. Its totient is φ = 40034280.

The previous prime is 51378167. The next prime is 51378179. The reversal of 51378173 is 37187315.

It is an interprime number because it is at equal distance from previous prime (51378167) and next prime (51378179).

It is not a de Polignac number, because 51378173 - 2⁴ = 51378157 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51378179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29483 + ... + 31176.

It is an arithmetic number, because the mean of its divisors is an integer number (5378520).

Almost surely, 2^51378173 is an apocalyptic number.

It is an amenable number.

51378173 is a deficient number, since it is larger than the sum of its proper divisors (13164067).

51378173 is a wasteful number, since it uses less digits than its factorization.

51378173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60688 (or 60677 counting only the distinct ones).

The product of its digits is 17640, while the sum is 35.

The square root of 51378173 is about 7167.8569321660. The cubic root of 51378173 is about 371.7573402031.

The spelling of 51378173 in words is "fifty-one million, three hundred seventy-eight thousand, one hundred seventy-three".