51917078 has 4 divisors (see below), whose sum is σ = 77875620. Its totient is φ = 25958538.

The previous prime is 51917071. The next prime is 51917087. The reversal of 51917078 is 87071915.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51917071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12979268 + ... + 12979271.

It is an arithmetic number, because the mean of its divisors is an integer number (19468905).

Almost surely, 2^51917078 is an apocalyptic number.

51917078 is a deficient number, since it is larger than the sum of its proper divisors (25958542).

51917078 is a wasteful number, since it uses less digits than its factorization.

51917078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25958541.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 51917078 is about 7205.3506507317. The cubic root of 51917078 is about 373.0526080182.

The spelling of 51917078 in words is "fifty-one million, nine hundred seventeen thousand, seventy-eight".