51496909 has 2 divisors, whose sum is σ = 51496910. Its totient is φ = 51496908.

The previous prime is 51496883. The next prime is 51496919. The reversal of 51496909 is 90969415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38378025 + 13118884 = 6195^2 + 3622^2 .

It is a cyclic number.

It is not a de Polignac number, because 51496909 - 2⁹ = 51496397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51496919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25748454 + 25748455.

It is an arithmetic number, because the mean of its divisors is an integer number (25748455).

Almost surely, 2^51496909 is an apocalyptic number.

It is an amenable number.

51496909 is a deficient number, since it is larger than the sum of its proper divisors (1).

51496909 is an equidigital number, since it uses as much as digits as its factorization.

51496909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 51496909 is about 7176.1346837974. The cubic root of 51496909 is about 372.0434994610.

The spelling of 51496909 in words is "fifty-one million, four hundred ninety-six thousand, nine hundred nine".