51897651 has 16 divisors (see below), whose sum is σ = 78904224. Its totient is φ = 30057984.

The previous prime is 51897647. The next prime is 51897673. The reversal of 51897651 is 15679815.

It is not a de Polignac number, because 51897651 - 2² = 51897647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51897611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38476 + ... + 39801.

It is an arithmetic number, because the mean of its divisors is an integer number (4931514).

Almost surely, 2^51897651 is an apocalyptic number.

51897651 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

51897651 is a deficient number, since it is larger than the sum of its proper divisors (27006573).

51897651 is a wasteful number, since it uses less digits than its factorization.

51897651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78310.

The product of its digits is 75600, while the sum is 42.

The square root of 51897651 is about 7204.0024292056. The cubic root of 51897651 is about 373.0060710055.

The spelling of 51897651 in words is "fifty-one million, eight hundred ninety-seven thousand, six hundred fifty-one".