51378963 has 4 divisors (see below), whose sum is σ = 68505288. Its totient is φ = 34252640.

The previous prime is 51378961. The next prime is 51378967. The reversal of 51378963 is 36987315.

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

It is a cyclic number.

It is not a de Polignac number, because 51378963 - 2¹ = 51378961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51378961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8563158 + ... + 8563163.

It is an arithmetic number, because the mean of its divisors is an integer number (17126322).

Almost surely, 2^51378963 is an apocalyptic number.

51378963 is a deficient number, since it is larger than the sum of its proper divisors (17126325).

51378963 is a wasteful number, since it uses less digits than its factorization.

51378963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17126324.

The product of its digits is 136080, while the sum is 42.

The square root of 51378963 is about 7167.9120390808. The cubic root of 51378963 is about 371.7592455958.

The spelling of 51378963 in words is "fifty-one million, three hundred seventy-eight thousand, nine hundred sixty-three".