51110001001 has 2 divisors, whose sum is σ = 51110001002. Its totient is φ = 51110001000.

The previous prime is 51110000989. The next prime is 51110001017. The reversal of 51110001001 is 10010001115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39109017600 + 12000983401 = 197760^2 + 109549^2 .

It is a cyclic number.

It is not a de Polignac number, because 51110001001 - 2¹⁹ = 51109476713 is a prime.

It is a super-2 number, since 2×51110001001² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51110001091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25555000500 + 25555000501.

It is an arithmetic number, because the mean of its divisors is an integer number (25555000501).

Almost surely, 2^51110001001 is an apocalyptic number.

It is an amenable number.

51110001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

51110001001 is an equidigital number, since it uses as much as digits as its factorization.

51110001001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5, while the sum is 10.

Adding to 51110001001 its reverse (10010001115), we get a palindrome (61120002116).

The spelling of 51110001001 in words is "fifty-one billion, one hundred ten million, one thousand, one".