51206971 has 2 divisors, whose sum is σ = 51206972. Its totient is φ = 51206970.

The previous prime is 51206921. The next prime is 51206989. The reversal of 51206971 is 17960215.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51206971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51206921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25603485 + 25603486.

It is an arithmetic number, because the mean of its divisors is an integer number (25603486).

Almost surely, 2^51206971 is an apocalyptic number.

51206971 is a deficient number, since it is larger than the sum of its proper divisors (1).

51206971 is an equidigital number, since it uses as much as digits as its factorization.

51206971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 51206971 is about 7155.9046248535. The cubic root of 51206971 is about 371.3439582762.

Subtracting from 51206971 its reverse (17960215), we obtain a square (33246756 = 5766²).

The spelling of 51206971 in words is "fifty-one million, two hundred six thousand, nine hundred seventy-one".