51132397 has 2 divisors, whose sum is σ = 51132398. Its totient is φ = 51132396.

The previous prime is 51132383. The next prime is 51132449. The reversal of 51132397 is 79323115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51065316 + 67081 = 7146^2 + 259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51132397 is a prime.

It is a super-2 number, since 2×51132397² = 5229044045931218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51132317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25566198 + 25566199.

It is an arithmetic number, because the mean of its divisors is an integer number (25566199).

Almost surely, 2^51132397 is an apocalyptic number.

It is an amenable number.

51132397 is a deficient number, since it is larger than the sum of its proper divisors (1).

51132397 is an equidigital number, since it uses as much as digits as its factorization.

51132397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5670, while the sum is 31.

The square root of 51132397 is about 7150.6920644089. The cubic root of 51132397 is about 371.1636048475.

It can be divided in two parts, 51132 and 397, that added together give a square (51529 = 227²).

The spelling of 51132397 in words is "fifty-one million, one hundred thirty-two thousand, three hundred ninety-seven".