51199397 has 2 divisors, whose sum is σ = 51199398. Its totient is φ = 51199396.

The previous prime is 51199373. The next prime is 51199409. The reversal of 51199397 is 79399115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27394756 + 23804641 = 5234^2 + 4879^2 .

It is a cyclic number.

It is not a de Polignac number, because 51199397 - 2¹² = 51195301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51199327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25599698 + 25599699.

It is an arithmetic number, because the mean of its divisors is an integer number (25599699).

Almost surely, 2^51199397 is an apocalyptic number.

It is an amenable number.

51199397 is a deficient number, since it is larger than the sum of its proper divisors (1).

51199397 is an equidigital number, since it uses as much as digits as its factorization.

51199397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76545, while the sum is 44.

The square root of 51199397 is about 7155.3753919693. The cubic root of 51199397 is about 371.3256489343.

The spelling of 51199397 in words is "fifty-one million, one hundred ninety-nine thousand, three hundred ninety-seven".