51672161 has 4 divisors (see below), whose sum is σ = 51778752. Its totient is φ = 51565572.

The previous prime is 51672097. The next prime is 51672193. The reversal of 51672161 is 16127615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51672161 - 2⁶ = 51672097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51662161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52565 + ... + 53538.

It is an arithmetic number, because the mean of its divisors is an integer number (12944688).

Almost surely, 2^51672161 is an apocalyptic number.

It is an amenable number.

51672161 is a deficient number, since it is larger than the sum of its proper divisors (106591).

51672161 is a wasteful number, since it uses less digits than its factorization.

51672161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106590.

The product of its digits is 2520, while the sum is 29.

The square root of 51672161 is about 7188.3350645334. The cubic root of 51672161 is about 372.4650622608.

Adding to 51672161 its reverse (16127615), we get a palindrome (67799776).

The spelling of 51672161 in words is "fifty-one million, six hundred seventy-two thousand, one hundred sixty-one".