51800491 has 2 divisors, whose sum is σ = 51800492. Its totient is φ = 51800490.

The previous prime is 51800477. The next prime is 51800501. The reversal of 51800491 is 19400815.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51800491 - 2⁵ = 51800459 is a prime.

It is equal to p_3102598 and since 51800491 and 3102598 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (51800401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25900245 + 25900246.

It is an arithmetic number, because the mean of its divisors is an integer number (25900246).

Almost surely, 2^51800491 is an apocalyptic number.

51800491 is a deficient number, since it is larger than the sum of its proper divisors (1).

51800491 is an equidigital number, since it uses as much as digits as its factorization.

51800491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 51800491 is about 7197.2557964824. The cubic root of 51800491 is about 372.7731516020.

The spelling of 51800491 in words is "fifty-one million, eight hundred thousand, four hundred ninety-one".