51101001521 has 2 divisors, whose sum is σ = 51101001522. Its totient is φ = 51101001520.

The previous prime is 51101001491. The next prime is 51101001527. The reversal of 51101001521 is 12510010115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45667690000 + 5433311521 = 213700^2 + 73711^2 .

It is a cyclic number.

It is not a de Polignac number, because 51101001521 - 2¹⁰ = 51101000497 is a prime.

It is a super-2 number, since 2×51101001521² (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 51101001521.

It is not a weakly prime, because it can be changed into another prime (51101001527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25550500760 + 25550500761.

It is an arithmetic number, because the mean of its divisors is an integer number (25550500761).

Almost surely, 2^51101001521 is an apocalyptic number.

It is an amenable number.

51101001521 is a deficient number, since it is larger than the sum of its proper divisors (1).

51101001521 is an equidigital number, since it uses as much as digits as its factorization.

51101001521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50, while the sum is 17.

Adding to 51101001521 its reverse (12510010115), we get a palindrome (63611011636).

The spelling of 51101001521 in words is "fifty-one billion, one hundred one million, one thousand, five hundred twenty-one".