51405989419 has 2 divisors, whose sum is σ = 51405989420. Its totient is φ = 51405989418.

The previous prime is 51405989407. The next prime is 51405989431. The reversal of 51405989419 is 91498950415.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (51405989407) and next prime (51405989431).

It is a cyclic number.

It is not a de Polignac number, because 51405989419 - 2¹⁹ = 51405465131 is a prime.

It is a super-2 number, since 2×51405989419² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51405989419.

It is not a weakly prime, because it can be changed into another prime (51405989449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25702994709 + 25702994710.

It is an arithmetic number, because the mean of its divisors is an integer number (25702994710).

Almost surely, 2^51405989419 is an apocalyptic number.

51405989419 is a deficient number, since it is larger than the sum of its proper divisors (1).

51405989419 is an equidigital number, since it uses as much as digits as its factorization.

51405989419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 51405989419 in words is "fifty-one billion, four hundred five million, nine hundred eighty-nine thousand, four hundred nineteen".