51222397 has 2 divisors, whose sum is σ = 51222398. Its totient is φ = 51222396.

The previous prime is 51222389. The next prime is 51222419. The reversal of 51222397 is 79322215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29822521 + 21399876 = 5461^2 + 4626^2 .

It is a cyclic number.

It is not a de Polignac number, because 51222397 - 2³ = 51222389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51222317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25611198 + 25611199.

It is an arithmetic number, because the mean of its divisors is an integer number (25611199).

Almost surely, 2^51222397 is an apocalyptic number.

It is an amenable number.

51222397 is a deficient number, since it is larger than the sum of its proper divisors (1).

51222397 is an equidigital number, since it uses as much as digits as its factorization.

51222397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 51222397 is about 7156.9823948365. The cubic root of 51222397 is about 371.3812434132.

The spelling of 51222397 in words is "fifty-one million, two hundred twenty-two thousand, three hundred ninety-seven".