51172997 has 2 divisors, whose sum is σ = 51172998. Its totient is φ = 51172996.

The previous prime is 51172987. The next prime is 51173011. The reversal of 51172997 is 79927115.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50608996 + 564001 = 7114^2 + 751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51172997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51172987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25586498 + 25586499.

It is an arithmetic number, because the mean of its divisors is an integer number (25586499).

Almost surely, 2^51172997 is an apocalyptic number.

It is an amenable number.

51172997 is a deficient number, since it is larger than the sum of its proper divisors (1).

51172997 is an equidigital number, since it uses as much as digits as its factorization.

51172997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39690, while the sum is 41.

The square root of 51172997 is about 7153.5303871585. The cubic root of 51172997 is about 371.2618156140.

The spelling of 51172997 in words is "fifty-one million, one hundred seventy-two thousand, nine hundred ninety-seven".