51356197 has 2 divisors, whose sum is σ = 51356198. Its totient is φ = 51356196.

The previous prime is 51356159. The next prime is 51356203. The reversal of 51356197 is 79165315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42588676 + 8767521 = 6526^2 + 2961^2 .

51356197 is a truncatable prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51356197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51356117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25678098 + 25678099.

It is an arithmetic number, because the mean of its divisors is an integer number (25678099).

Almost surely, 2^51356197 is an apocalyptic number.

It is an amenable number.

51356197 is a deficient number, since it is larger than the sum of its proper divisors (1).

51356197 is an equidigital number, since it uses as much as digits as its factorization.

51356197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 37.

The square root of 51356197 is about 7166.3238135044. The cubic root of 51356197 is about 371.7043286879.

The spelling of 51356197 in words is "fifty-one million, three hundred fifty-six thousand, one hundred ninety-seven".