51154748989 has 2 divisors, whose sum is σ = 51154748990. Its totient is φ = 51154748988.

The previous prime is 51154748951. The next prime is 51154749067. The reversal of 51154748989 is 98984745115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31297148100 + 19857600889 = 176910^2 + 140917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51154748989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51154748189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25577374494 + 25577374495.

It is an arithmetic number, because the mean of its divisors is an integer number (25577374495).

Almost surely, 2^51154748989 is an apocalyptic number.

It is an amenable number.

51154748989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51154748989 is an equidigital number, since it uses as much as digits as its factorization.

51154748989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 61.

The spelling of 51154748989 in words is "fifty-one billion, one hundred fifty-four million, seven hundred forty-eight thousand, nine hundred eighty-nine".