51701237989 has 2 divisors, whose sum is σ = 51701237990. Its totient is φ = 51701237988.

The previous prime is 51701237983. The next prime is 51701238013. The reversal of 51701237989 is 98973210715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49255144225 + 2446093764 = 221935^2 + 49458^2 .

It is a cyclic number.

It is not a de Polignac number, because 51701237989 - 2⁵ = 51701237957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51701237983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25850618994 + 25850618995.

It is an arithmetic number, because the mean of its divisors is an integer number (25850618995).

Almost surely, 2^51701237989 is an apocalyptic number.

It is an amenable number.

51701237989 is a deficient number, since it is larger than the sum of its proper divisors (1).

51701237989 is an equidigital number, since it uses as much as digits as its factorization.

51701237989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 51701237989 in words is "fifty-one billion, seven hundred one million, two hundred thirty-seven thousand, nine hundred eighty-nine".