51404623 has 2 divisors, whose sum is σ = 51404624. Its totient is φ = 51404622.

The previous prime is 51404621. The next prime is 51404677. The reversal of 51404623 is 32640415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51404623 - 2¹ = 51404621 is a prime.

Together with 51404621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51404621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25702311 + 25702312.

It is an arithmetic number, because the mean of its divisors is an integer number (25702312).

Almost surely, 2^51404623 is an apocalyptic number.

51404623 is a deficient number, since it is larger than the sum of its proper divisors (1).

51404623 is an equidigital number, since it uses as much as digits as its factorization.

51404623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 51404623 is about 7169.7017371715. The cubic root of 51404623 is about 371.8211240642.

The spelling of 51404623 in words is "fifty-one million, four hundred four thousand, six hundred twenty-three".