51680997 has 18 divisors (see below), whose sum is σ = 77527398. Its totient is φ = 34449624.

The previous prime is 51680983. The next prime is 51681011. The reversal of 51680997 is 79908615.

51680997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51680983) and next prime (51681011).

It can be written as a sum of positive squares in only one way, i.e., 35928036 + 15752961 = 5994^2 + 3969^2 .

It is not a de Polignac number, because 51680997 - 2¹⁰ = 51679973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51680957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2623 + ... + 10499.

Almost surely, 2^51680997 is an apocalyptic number.

It is an amenable number.

51680997 is a deficient number, since it is larger than the sum of its proper divisors (25846401).

51680997 is an frugal number, since it uses more digits than its factorization.

51680997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7901 (or 7880 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 51680997 is about 7188.9496451151. The cubic root of 51680997 is about 372.4862917046.

The spelling of 51680997 in words is "fifty-one million, six hundred eighty thousand, nine hundred ninety-seven".