51804997 has 2 divisors, whose sum is σ = 51804998. Its totient is φ = 51804996.

The previous prime is 51804989. The next prime is 51805051. The reversal of 51804997 is 79940815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46049796 + 5755201 = 6786^2 + 2399^2 .

It is a cyclic number.

It is not a de Polignac number, because 51804997 - 2³ = 51804989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51804097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25902498 + 25902499.

It is an arithmetic number, because the mean of its divisors is an integer number (25902499).

Almost surely, 2^51804997 is an apocalyptic number.

It is an amenable number.

51804997 is a deficient number, since it is larger than the sum of its proper divisors (1).

51804997 is an equidigital number, since it uses as much as digits as its factorization.

51804997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 51804997 is about 7197.5688256522. The cubic root of 51804997 is about 372.7839601683.

The spelling of 51804997 in words is "fifty-one million, eight hundred four thousand, nine hundred ninety-seven".