51148439989 has 2 divisors, whose sum is σ = 51148439990. Its totient is φ = 51148439988.

The previous prime is 51148439981. The next prime is 51148440047. The reversal of 51148439989 is 98993484115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50942747025 + 205692964 = 225705^2 + 14342^2 .

It is a cyclic number.

It is not a de Polignac number, because 51148439989 - 2³ = 51148439981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51148439981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25574219994 + 25574219995.

It is an arithmetic number, because the mean of its divisors is an integer number (25574219995).

Almost surely, 2^51148439989 is an apocalyptic number.

It is an amenable number.

51148439989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51148439989 is an equidigital number, since it uses as much as digits as its factorization.

51148439989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11197440, while the sum is 61.

The spelling of 51148439989 in words is "fifty-one billion, one hundred forty-eight million, four hundred thirty-nine thousand, nine hundred eighty-nine".