51863951 has 4 divisors (see below), whose sum is σ = 51945504. Its totient is φ = 51782400.

The previous prime is 51863947. The next prime is 51863971. The reversal of 51863951 is 15936815.

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 51863951 - 2² = 51863947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51863971) 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, 39815 + ... + 41096.

It is an arithmetic number, because the mean of its divisors is an integer number (12986376).

Almost surely, 2^51863951 is an apocalyptic number.

51863951 is a deficient number, since it is larger than the sum of its proper divisors (81553).

51863951 is an equidigital number, since it uses as much as digits as its factorization.

51863951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81552.

The product of its digits is 32400, while the sum is 38.

The square root of 51863951 is about 7201.6630718189. The cubic root of 51863951 is about 372.9253157356.

The spelling of 51863951 in words is "fifty-one million, eight hundred sixty-three thousand, nine hundred fifty-one".