51911278 has 16 divisors (see below), whose sum is σ = 78704640. Its totient is φ = 25678296.

The previous prime is 51911263. The next prime is 51911281. The reversal of 51911278 is 87211915.

It is a happy number.

It is a super-5 number, since 5×51911278⁵ (a number of 40 digits) contains 55555 as substring.

It is a congruent number.

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, 106351 + ... + 106837.

It is an arithmetic number, because the mean of its divisors is an integer number (4919040).

Almost surely, 2^51911278 is an apocalyptic number.

51911278 is a deficient number, since it is larger than the sum of its proper divisors (26793362).

51911278 is a wasteful number, since it uses less digits than its factorization.

51911278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951.

The product of its digits is 5040, while the sum is 34.

The square root of 51911278 is about 7204.9481608128. The cubic root of 51911278 is about 373.0387154432.

The spelling of 51911278 in words is "fifty-one million, nine hundred eleven thousand, two hundred seventy-eight".