51679669 has 2 divisors, whose sum is σ = 51679670. Its totient is φ = 51679668.

The previous prime is 51679657. The next prime is 51679673. The reversal of 51679669 is 96697615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49533444 + 2146225 = 7038^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 51679669 - 2⁵ = 51679637 is a prime.

It is a super-2 number, since 2×51679669² = 5341576375899122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51679619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25839834 + 25839835.

It is an arithmetic number, because the mean of its divisors is an integer number (25839835).

Almost surely, 2^51679669 is an apocalyptic number.

It is an amenable number.

51679669 is a deficient number, since it is larger than the sum of its proper divisors (1).

51679669 is an equidigital number, since it uses as much as digits as its factorization.

51679669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 51679669 is about 7188.8572805419. The cubic root of 51679669 is about 372.4831011958.

The spelling of 51679669 in words is "fifty-one million, six hundred seventy-nine thousand, six hundred sixty-nine".